105 Results
Exceptions to the Periodic Law   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Ionic Sizes   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atomic Sizes   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electron Configurations and the Periodic Table   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Avogadro Constant   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Nucleus   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atomic Weights   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Testing the Atomic Theory   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Atomic Theory   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Valence   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Bohr Theory of the Atom   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Nature of Electromagnetic Radiation   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electronegativity   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Polarizability   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Octet Rule   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electron Affinities   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Ionization of Transition and Inner Transition Elements   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Ions and Noble-Gas Electron Configurations   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electron Configurations   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Beryllium, Boron, Carbon   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Hydrogen, Helium, Lithium   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atoms Having More Than One Electron   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Quantum Numbers   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Orbitals   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Wave Nature of the Electron   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electrons and Valence   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Average Atomic Weights   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atomic Structure and Isotopes   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Electron   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Nuclear Atom   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Implications of Periodicity for Atomic Theory   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Amount of Substance: Moles   
(Other (1))
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Bonding   
(Movie/Animation, Audio/Visual (7))
Reactions and demonstrations that explore the concepts of bonding.
Isotopes: Heavy Water Ice Cubes   
(Movie/Animation, Audio/Visual (4))
An H2O ice cube is shown to float in a beaker of liquid water, while an ice cube of D2O (heavy water) is shown to sink in liquid water.
Ferrofluid   
(Movie/Animation, Audio/Visual (3))
A magnet placed just below a dish containing ferrofluid generates an array of spikes in the fluid.
Paramagnetism: Nitrogen and Oxygen   
(Movie/Animation, Audio/Visual (3))
A magnet is shown to strongly attract a pair of metal tongs. The magnet has no visible effect on liquid nitrogen, but when pale blue liquid oxygen is poured near the poles of the magnet, it shows definite attraction.
Paramagnetism: Oxidation States of Manganese   
(Movie/Animation, Audio/Visual (3))
Manganese(III) oxide, with 4 unpaired electrons per Mn atom, is more strongly attracted to a magnet than is manganese(IV) oxide, with only 3 unpaired electrons per Mn atom. Potassium permanganate, a compound of Mn(VII), has no unpaired electrons and is not attracted to a magnet.
Ferrimagnetism   
(Movie/Animation, Audio/Visual (2))
Precipitation reactions are used to produce iron(III) oxide (Fe2O3 called hematite) and mixed iron(II)/iron(III) oxide (Fe3O4 called magnetite). The particles in the slurry of hematite are not attracted to a magnet, but the particles in the slurry of magnetite are.
Electronic Structure-Periodic Table   
(Movie/Animation, Audio/Visual (12))
Reactions exploring the concepts of atomic structure.
Colors of Elements in a Flame   
(Movie/Animation, Audio/Visual (11))
Aqueous solutions of various compounds are sprayed into a Meeker burner flame from an atomizer.
Paramagnetism: Compounds   
(Movie/Animation, Audio/Visual (11))
Vials of a number of compounds (NaCl, MnSO4, FeSO4, CoCl2, NiSO4, ZnSO4, K4Fe(CN)6, [Co(NH3)6]Cl3, [Ni(NH3)6]Cl2, and H2O) are hung from a thread. When a magnet is brought near, some of the vials are attracted.
Reactions : IDOxidationNumber (10 Variations)   
(Assessment Material (1))
What is the oxidation number of sulfur in barium sulfate (BaSO4)?
Reactions : HighOxNumber (10 Variations)   
(Assessment Material (1))
In which of the following does sulfur have the highest oxidation number?
Atoms,_Molecules_and_Ions : IonChargeSubatmParts (10 Variations)   
(Assessment Material (1))
What is the charge on an ion that contains 47 protons, 62 neutrons, and 46 electrons?
Atoms,_Molecules_and_Ions : CompareParticles (20 Variations)   
(Assessment Material (1))
Which has the greater number of particles, 1 mol O2 or 1 mol O?
Atoms,_Molecules_and_Ions : CompareElements (10 Variations)   
(Assessment Material (1))
Which of the following is something that nitrogen and antimony have in common?
Atoms,_Molecules_and_Ions : IonCharge (12 Variations)   
(Assessment Material (1))
Identify each of the following ions as having the correct or incorrect charge.
Atomic_Structure_and_the_Periodic_Table : Isoelectronic (4 Variations)   
(Assessment Material (1))
Which of the following atoms or ions does NOT have an electron configuration of [He]2s22p6?
Atomic_Structure_and_the_Periodic_Table : IonizationEnerTrends (10 Variations)   
(Assessment Material (1))
Which of the following groups of elements is arranged correctly in order of increasing first ionization energy?
Atomic_Structure_and_the_Periodic_Table : GeneralPeriodicTrends (5 Variations)   
(Assessment Material (1))
Which of the following statements is an INCORRECT description of periodic trends for main group elements?
Atomic_Structure_and_the_Periodic_Table : ExplainPeriodicTrends (10 Variations)   
(Assessment Material (1))
In an isoelectronic series the ionic radii...
Atomic_Structure_and_the_Periodic_Table : CompareRadii (10 Variations)   
(Assessment Material (1))
Which of the following have larger radii than a fluorine atom?
Atomic_Structure_and_the_Periodic_Table : CompareElectConfigs (8 Variations)   
(Assessment Material (1))
Compare the following two elements, identified by their electron configurations:

A - [Kr]4d95s2
B - [Ar]3d104s24p4

Select the answer(s) that has the correct comparison between elements.

Stoichiometry : CompareParticles (20 Variations)   
(Assessment Material (1))
Which has the greater number of particles, 1 mol O2 or 1 mol O?
Molecular_Structure : AtomFromGeometry (8 Variations)   
(Assessment Material (1))
Which atom or atoms could be the central atom, X, in the stable molecule XH3 with one lone pair of electrons?
Atoms,_Molecules_and_Ions : NameIsotope (10 Variations)   
(Assessment Material (1))
Which of the following represents an atom that has 19 protons, 19 electrons, and 21 neutrons?
Atoms,_Molecules_and_Ions : GeneralSubatmParts (7 Variations)   
(Assessment Material (1))
Which two of the subatomic particles have equal, but opposite, charges?
Atoms,_Molecules_and_Ions : ElemtAndSubatmParts (10 Variations)   
(Assessment Material (1))
Give the number of electron, protons, and neutrons in an atom of 14C.
Atoms,_Molecules_and_Ions : CalcAtmWeight (10 Variations)   
(Assessment Material (1))
Chlorine has two naturally occurring isotopes, 35Cl and 37Cl, with masses of 34.9689 amu and 36.9659 amu, respectively. Calculate the abundances of these isotopes of chlorine.
Atoms,_Molecules_and_Ions : DescrSubatmParts (8 Variations)   
(Assessment Material (1))
Identify each of the following statements as describing a proton, neutron, or electron.
Atomic_Structure_and_the_Periodic_Table : GeneralOrbitals (4 Variations)   
(Assessment Material (1))
Which of the following statements about orbitals in multi-electron atoms is CORRECT?
Atomic_Structure_and_the_Periodic_Table : EnergyInEinstein (10 Variations)   
(Assessment Material (1))
Calculate the energy of one mole of photons (an Einstein) for the 589 nm yellow line of the sodium spectrum.
Atomic_Structure_and_the_Periodic_Table : CorrectBoxDiagram (10 Variations)   
(Assessment Material (1))
Which of the following orbital box diagrams is correct?
Atomic_Structure_and_the_Periodic_Table : CompareEMRadiation (12 Variations)   
(Assessment Material (1))
Which of the following have photons with less energy than those of blue light?
Atomic_Structure_and_the_Periodic_Table : ColorFromFrequency (10 Variations)   
(Assessment Material (1))
According to the electromagnetic spectrum, what color is light that has a frequency of 6.95x1014Hz?
Atomic_Structure_and_the_Periodic_Table : AtomicNumElecConfig (10 Variations)   
(Assessment Material (1))
An element X has atomic number 13. Which of the following statements about the electron configuration of X is correct?
Atomic_Structure_and_the_Periodic_Table : ValenceTotalElectrons (10 Variations)   
(Assessment Material (1))
Given the following electron configuration:
1s22s22p63s2
1. How many total electrons are in this species? {1:SHORTANSWER:~=12}

2. How many valence electrons are in this species? {1:SHORTANSWER:~=2}

Atomic_Structure_and_the_Periodic_Table : MatchElectronConfig (10 Variations)   
(Assessment Material (1))
Match the following electron configurations to the correct atoms or ions. Possible choices are: Br, Ca, Cl-, Mg2+, Mn, and Ti2+.
Atomic_Structure_and_the_Periodic_Table : BohrConceptMap (4 Variations)   
(Assessment Material (1))
In a concept map the terms are connected with arrows. The words along an arrow can be placed between the words in two ovals to make a true statement.

An incomplete concept map is shown below, which set of terms for A, B, C and D would result in a correct map based on the concept of wave mechanics applied to a hydrogen atom?

Atomic_Structure_and_the_Periodic_Table : ElectronBoxConfig (10 Variations)   
(Assessment Material (1))
Which of the elements or ions below has the following orbital box diagram?

Atomic_Structure_and_the_Periodic_Table : ParaDiMagnetVideo (8 Variations)   
(Assessment Material (1))

The video shows a substance being slowly moved toward a large magnet. Which of the following ions could be in the compound seen in the video?

Atomic Structure and the Periodic Table   
(Article (36))
Volume 05, issue 04 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Atoms and Electrons   
(Article (36))
Volume 04, issue 31 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
The Constitution of Matter   
(Article (36))
Volume 05, issue 03 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Modern Atomic Theory   
(Article (34))
Volume 03, issue 31 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Families of Elements   
(Article (20))
Volume 03, issue 03 of a series of leaflets covering subjects of interest to students of elementary chemistry distributed in 1929 - 1932.
Using the Molar Mass of Water   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atomic Weights and Water   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Water   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Molecular Model for Water   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Water; Foundation for Life   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Isotope Fingerprinting   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Discovery of Isotopes and Invention of the Mass Spectrograph   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Detection of Performance-Enhancing Drugs (Doping) in Sports   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Tones on a Drum and Orbital Wavefunctions   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electrons and Valence for Simple Biologically Active Ions   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
ifoods-Eat Isotopes to Live Longer   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Oxygen Isotopes and the Origin of the Planets   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Atomic Scale Paleontology   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Thyroid Hormone and CuI Dietary Supplement   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Is the percentage of iodine the same in all CuI mineral supplements   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Elements of Mars   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Sources of Copper and Iodine Micronutrients   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Mineral Nutrients Potassium and Iodine   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
History of the Atomic Theory   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Elemental Diets   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Molecular Gastronomy and the Color of Cooked Green Beans   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Electron Configurations Lecture Demonstrations   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Electronic Structure of Atoms Lecture Demonstrations   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Biological Applications of Electronic Structure   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Average Atomic Weights Lecture Demonstrations   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Tracing Fast Food Beef to Confined Animal Feeding Operations   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Average Atomic Weights and Tracking Migrating Songbirds   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
The Electron Lecture Demonstrations   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
Fundamental Properties of Electrons-Frogs Legs to Electron Transport   
()
A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.