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10 Cards in this Set

  • Front
  • Back

The smallest particle of an element that retains all the properties of that element is electrically neutral.

Atom

The number of protons

atomic number

number of protons plus the number of neutrons

mass number

The weighted average mass of the isotopes of that element

Atomic mass

Atoms of the same element with the same number of protons but different number of neutrons.

isotopes

One-twelfth th mass of a carbon-12 atom

atomic mass unit

A negatively charged particle

electron

contains protons and neutrons

Nucleus

a positively charged particle

proton

A neutral subatomic particle in an atom nucleus that has a mass nearly equal to that of a proton.

neutron