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Understanding the Atom

Across
Atoms of the same element that have different numbers of neutrons
Charge of an electron
First guy to propose that matter is made of atoms
Elements that spontaneously emit radiation
Area around the nucleus where electrons are located
Average mass of an elements isotopes. Also called atomic weight.
Unstable nucleus becomes more stable by emitting radiation
Charge of a proton
Elementary particles that make up protons and neutrons
Subatomic particle with a neutral charge
Down
1700s teacher that proposed the atomic theory
Atom that has gained or lost electrons
Number of protons in an element
Number of protons and neutrons in an atom
Center of an atom with a positive charge
Subatomic particle with a negative charge
Subatomic particle with a positive charge
Smallest unit of matter that still represents an element