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| Radiation composed of helim atoms minus their orbiting electrons. |
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| The sum of the number of protons and neutrons in the nucleus of an atom. |
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| The number of protons in the nucleus of an atom. |
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| Radiation composed of electrons. |
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| A type of emission spectrum showing a continuous band of colors all blending into one another. |
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| A glass tube filled from bottom to top with liquids of successively lighter densities; used to determine the density distribution of soil. |
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| A negatively charged particle that is one of the fundamental structural units of the atom. |
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| The path of electrons as they move around the nuclei of atoms; each orbital is associated with a particular electronic energy level. |
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| Light emitted from a source and separated into its component colors or frequencies. |
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| The state in which an atom absorbs energy and an electron moves from a lower to a higher energy level. |
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| A high-energy form of electromagnetic radiation. |
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| An atom differing from another atom of the same element in the number of neutrons in its nucleus. |
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| A type of emission spectrum showing a series of lines separated by black areas. Each line represents a definite wavelength or frequency. |
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| A naturally occurring crystalline solid. |
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| A particle with no electrical charge that is one of the basic structures in the nucleus of an atom. |
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| The core of an atom, consisting of protons and neutrons. |
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| A positively charged particle that is one of the basic structures in the nucleus of an atom. |
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| The docomposition of organic matter by heat. |
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Definition
| The emission of high-energy subatomic particles that accompanies the spontaneous disintegration of unstable nuclei. |
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