VQuiz - 1.2 Structure of an Atom

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7 Terms

1
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nucleus

the center of he atom that contains all of the mass and all of the positive charge

2
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atom

the basic unit of a chemical element, meaning it is the smallest piece of matter that retains the characteristic properties of that element

3
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proton

the subatomic particles with a positive charge in the nucleus

4
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neutron

a subatomic particles with mass equal to the proton but no charge, in the nucleus

5
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electron

a subatomic particles with a negative charge, outside the nucleus

6
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atomic number

number of protons in the nucleus for each element

  • on periodic table

7
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mass number

the total mass of an individual atom, equal to the sum of the protons plus the neutrons