Taken from the book Modern Chemistry by Holt, Rinehart, and Winston on Chapters 4 and 5, which deals with electrons and the periodic table. Includes the chapter vocabulary and a few other useful things.
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| 1186072920 | electromagnetic radiation | A form of energy that exhibits wavelike behavior as it travels through space (3.00x10⁸ m/s) | 1 | |
| 1186072921 | electromagnetic spectrum | Combination of all the forms of electromagnetic radiation. | 2 | |
| 1186072922 | wavelength | Distance between corresponding points on adjacent waves. Measure in some type of meters (m). | 3 | |
| 1186072923 | frequency | Number of waves that pass a given point in a specific time, usually one second. Measured in Hertz. | 4 | |
| 1186072924 | hertz | One wave per second. | 5 | |
| 1186072925 | photoelectric effect | Emission of electrons from a metal when light shines on a metal. | 6 | |
| 1186072926 | quantum | Minimum quantity of energy that can be lost or gained by an atom. | 7 | |
| 1186072927 | photon | Particle of electromagnetic radiation having zero mass and carrying a quantum of energy. | 8 | |
| 1186072928 | ground state | Lowest energy state of an atom. | 9 | |
| 1186072929 | excited state | State in which an atom has a higher potential energy than it has in it's ground state. | 10 | |
| 1186072930 | Heisenberg Uncertainty Principle | States that it is impossible to determine simultaneously both the position and velocity of an electron or any other particle. | 11 | |
| 1186072931 | Quantum Theory | Describes mathematically the wave properties of electrons and other very small particles. | 12 | |
| 1186072932 | orbital | A 3D region around the nucleus that indicates the probable location of an electron. | 13 | |
| 1186072933 | Quantum Numbers | Specify the properties of atomic orbitals and the properties of electrons in orbitals. | 14 | |
| 1186072934 | Principle Quantum Number | Denotes the energy level (1, 2, 3, etc.) | 15 | |
| 1186072935 | Angular Momentum Quantum Number | The suborbitals of an atom. (S, P, D, F) | 16 | |
| 1186072936 | Magnetic Quantum Number | Which suborbital. (Py, Px, Pz) | 17 | |
| 1186072937 | Spin Quantum Number | Which way it spins. (up or down) | 18 | |
| 1186072938 | electron configuration | The arrangement of electrons in an atom | 19 | |
| 1186072939 | noble gas | The Group 18 elements (helium, neon, argon, krypton, xenon, and radon) | 20 | |
| 1186072940 | noble gas configuration | An outer main energy level occupied, in most cases, by 8 electrons | 21 | |
| 1186072941 | Aufbau principle | Electrons fill from lowest energy to highest. | 22 | |
| 1186072942 | Hund's Rule | each orbital within a given sublevel gets one electron and then and only then can they have seconds. | 23 | |
| 1186072943 | The Pauli Exclusion Principle | within one orbital, one electron spins up and one spins down. | 24 | |
| 1186072944 | Bohr | electrons travel in orbits (energy levels) | 25 | |
| 1186072945 | deBroglie | everything has a wavelength | 26 | |
| 1186072946 | Schrödinger | made wave equation for deBroglie's statement (mass is relative to wavelength) | 27 | |
| 1186072947 | Electrons are like particles because of what? | photoelectric effect | 28 | |
| 1186072948 | Electrons are like waves because of what? | diffraction (bending of waves) and interference (combination of waves that either cancels out or strengthens the wave). | 29 | |
| 1186072949 | Emission spectrum | the light that something emits | 30 | |
| 1186072950 | Emission signature | individual to every substance; used to identify elements | 31 | |
| 1186072951 | Light | electrons jumping from one energy level to another and then back | 32 | |
| 1186072952 | periodic law | The physical and chemical properties of the elements are periodic functions of their atomic numbers. | 33 | |
| 1186072953 | periodic table | An arrangement of the elements in order of their atomic numbers so that the elements with similar properties fall in the same column or group. | 34 | |
| 1186072954 | lanthanide | The 14 elements with the atomic numbers 58-71. | 35 | |
| 1186072955 | actinide | The 14 elements with the atomic numbers 90-103. | 36 | |
| 1186072956 | alkali metals | The elements of group 1 of the periodic table. | 37 | |
| 1186072957 | alkaline-earth metals | The elements of group 2 of the periodic table. | 38 | |
| 1186072958 | transition metals | The d-block elements are metals with typical metallic properties. | 39 | |
| 1186072959 | main-group elements | The p-block elements together with the s-block elements. | 40 | |
| 1186072960 | halogens | The elements of group 17 of the periodic table. | 41 | |
| 1186072961 | atomic radius | 1/2 the distance between the nuclei of identical atoms that are bonded together. | 42 | |
| 1186072962 | ion | An atom or group of bonded atoms that has a positive or negative charge. | 43 | |
| 1186072963 | ionization | Any process that results in the formation of an ion. | 44 | |
| 1186072964 | ionization energy | The energy required to remove one electron from a neutral atom of an element. | 45 | |
| 1186072965 | electron affinity | The energy change that occurs when an electron is acquired by a neutral atom. | 46 | |
| 1186072966 | cation | A positive ion. | 47 | |
| 1186072967 | anion | A negative ion. | 48 | |
| 1186072968 | valence electrons | The electrons available to be lost, gained, or shared in the formation of chemical compounds. | 49 | |
| 1186072969 | electronegativity | A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound. | 50 |
