Atomic Structures

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9 Terms

1
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Both protons and neutrons have a mass of

1

2
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Electrons

2000 x smaller

3
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The number of protons and electrons of a neutral atom are

The same

4
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Isotopes

Same number of protons and different number of neutrons

5
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In an election dot diagram

The kernel of the atom is represented by the letter symbol for the element, and the valence electrons are represented by dots

6
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An election

Has a smaller mass than a proton and a negative charge

7
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The mass number is

Is the sum of protons and neutrons

8
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The small dense nucleus contains

Both protons and neutrons and is located inside the electron shells of an atom

9
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Energy is released when an excited electron

Falls to a lower energy level appears as light