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WHSCHEM1ATOMS

kmccullen

WHSCHEM1ATOMS

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Across
7.the total number of protons and neutrons in the nucleus (2 Words)
8.vertical columns on the periodic table
11.negatively charged subatomic particles
13.any atom or group of atoms with a negative charge
Down
1.used the "gold foil" experiment to prove the existence of the nucleus
2.outermost electrons
3.created the "plum pudding" model of the atom
4.developed the "planetary model" of an atom
5.what forms when atoms or ions join together to form new substances
6.atoms that belong to the same element; have the same number of protons, but different number of neutrons
9.credited with the development of an early atomic theory
10.positively charged subatomic particles
12.any atom or group of atoms with a postive charge
13.the smallest particle of an element that retains the properties of that element (extremely small)

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