| Term | Definition |
|---|
| Quanta | Max Planck proposed that energy is radiated continuously in little packets called ________. |
| Quark | A(n) _______ is a theoretical particle that is believed to be a constituent of a hadron. |
| Mass number | The ______ refers to the total number of nucleons is an atom. |
| Neutrino | A(n) _______ is an essentially massless, neutral lepton, |
| Law of definite proportions | The ______ states that specific substances always contain elements in the same ratio by mass. |
| Alpha particle | Another name for helium nucleus is a(n) __________. |
| Lepton | A(n) _______ is any of a class of light, elementary subatomic particles. |
| Hertz | Frequency is measured in a unit called a(n) _________, which is equal to one cycle per second. |
| Cathode ray | A stream of electrons traveling toward the anode is a(n) _______. |
| Spectroscopy | The methods of studying substances that are exposed to some sort of continuous exciting energy are referred to as _______. |
| Meson | A(n) _______ is a hadron composed of a quark and an antiquark. |
| Antiparticle | For every particle, a mirror-image particle, called a(n) _________. |
| Isotope | A(n) ________ is an atom that has the same number of protons as another atom, but a different number of neutrons. |
| Gluon | A theoretical particle exchanged by quarks is called a(n) _______. |
| Spectrum | The _______ of a substance is the unique set of wavelengths absorbed or emitted by that substance. |
| Radioactivity | The phenomenon of the spontaneous production of rays by unstable atomic nuclei is called _____. |
| Atomic mass | When masses and relative amounts of isotopes have been found, the average _______ can be calculated. |
| Gamma ray | A very-high-energy X ray given off by a nucleus is called a(n) ________. |
| Anode | In a cathode-ray tube, the positive terminal is called a(n) _______. |
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