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Atoms and Elements

Across
Occurs when an unstable atomic nucleus changes
Electrons move in a circular orbit around the nucleus
Electrons in the outer shell of atom
Chart of the elements arranged into rows and columns
Positively charged atomic particle
Atoms of the same element that have different # of neutrons
Negatively charged particle
Down
Small area in the center of the atom
An area around an atomic nucleus
Number of protons in an element
Combined atoms
Number of protons plus number of neutrons
Neutrally charged atomic particle
The smallest unit of matter