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Module 13 Vocab

Across
The sum of the numbers of neutrons and protons in the nucleus of an atom
An atom with a nucleus that is not stable
A schematic description of a system that accounts for its known properties
The center of an atom, containing the protons and neutrons
Down
The number of protons in an atom
The time it take for half of the original sample of a radioactive isotope to decay
Atoms with the same number of protons but different numbers of neutrons
A collection of atoms that all have the same number of protons