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SCIENCE HELP PLEASE!!!!!!!!!!!!!!!!!!!!

SCIENCE HELP PLEASE!!!!!!!!!!!!!!!!!!!!-example-1

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atomic #: 42
chemical symbol: Mo
# of protons: 42
atomic mass: 96
# of electrons: 42
# of valance electrons: 6
# of electrons in the n = 3 shell: 18
# of neutrons: 54
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