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Intro Chem A Final
| Question | Answer |
|---|---|
| Matter | Has mass and occupies space. |
| Cathode ray | Glowing beam that traveled from cathode to anode. |
| Isotopes | Atoms that have the same number of protons but different number of neutrons. |
| Atomic mass | Element weighted average mass of atoms in a naturally occurring sample of the element. |
| Quantum | Amount of energy required to move an electron from one energy level to another. |
| Aufbau principle | Electrons occupy orbitals of lowest energy first. |
| Pauli exclusion principle | Atomic orbital may describe at most two electrons. |
| Spin | Quantum mechanical property of electrons. |
| Hund's rule | Electrons occupy orbitals of same energy in a way that makes the number of electrons with the same spin direction as large as possible. |
| Amplitude | Wave's height from zero to the crest. |
| Hertz | SI unit of cycles per second. |
| Electromagnetic radiation | Includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays and gamma rays. |
| Spectrum | Sunlight passing through a prism separates them into different wavelengths. |
| Atomic emission spectrum | Wavelengths of spectral lines are characteristics of the element. |
| Planck's constant | (n) has value of 6.626 x 10^-34 J*s |
| Photoelectric effect | Electrons are ejected when light shines on metal. |
| Heisenburg uncertainity principle | States that it is impossible to know both velocity and position of a particle at the same time. |
| Radioisotopes | Unstable isotope nuclear reactions begin with. |
| Alpha particle | Two protons and neutrons has double positive charge. |
| Beta particle | Electron result from breaking apart from a neutron in an atom. |
| Gamma Ray | High energy photon emitted by radioisotope. |
| Nuclear Force | Attractive force that acts between all nuclear particles that are extremely close together. |
| Band of stability | Region of the graph in which these points are located. |
| Positron | Particle with mass of an electron but a positive charge. |
| -Half-life | Amount of time for substance to decay in half. |
| Transmutation | Conversion of atom of one element into atom of another element. |
| Transuranium elements | Elements with atomic numbers above 92. |
| Fission | Nuclei of certain isotopes are bombarded with neutrons. |
| Neutron moderation | Process that slows down neutrons so reactor fuel can capture them to continue chain reaction. |
| Neutron absorption | Process that decreases the number of slow-moving neutrons. |
Created by:
MakStabs18
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