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9 Terms

1
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electron

negative charge

orbit nucleus

1/2000 weight of proton/neutron (0)

2
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proton

positive charge

located in nucleus

mass of 1

3
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neutron

no charge

located in nucleus

mass of 1

4
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what holds the atom together?

the electromagnetic force of attraction between the positive protons and negative electrons

5
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define mass number

[atomic weight]

total weight of the atom

[neutrons + protons]

6
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define atomic number

total amount of protons in the atom

[and electrons, but only in nuetral atoms]

7
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define valence electrons

valence electrons are the electrons in the outermost shell

8
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define polyatomic ion

a polyatomic ion is two or more atoms that are covalently bonded

9
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define isotope

an isotope is a variation of an atom, but with fewer or more neutrons