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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. |