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Chemistry Unit 3 Quiz 1

Terms in this set (13)

atomic mass or mass number
The number of protons plus neutrons in the nucleus.
electron
Negative subatomic particles; symbolized by e-; located outside the nucleus; in constant motion; 1/1,837 the mass of a proton
ion
Atom or group of atoms with a net charge caused by unequal numbers of electrons and protons.
isotope
Members of the same element (same atomic number) but different mass number due to different numbers of neutrons in the nucleus.
radioactive
Unstable and capable of disintegrating into different elements, producing radiation and energy.
alpha particle
Helium nucleus emitted from the nucleus of a decaying isotope; represented by He2+.
beta particle
An electron or particle similar to an electron emitted from the nucleus with negligible mass and a charge of -1; represented by β-.
emission spectrum
The distribution of light when passed through a prism or other device that breaks the light into its individual components.
gamma ray
High energy ray emitted from some radioactive atoms.
neutron
Neutral particle found in the nucleus; mass nearly equal to that of a proton; neutrons plus protons constitute mass of atom.
nucleus
The central core of the atom containing most of the mass and made up of protons and neutrons.
proton
One of the particles of the nucleus; positively charged; symbolized by p; assigned a mass value of 1 unit; protons plus neutrons constitute mass of atom.
quantum
Energy available or given off in specific, predictable quantities.
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