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An atom of a mystery element contains 7 protons, 7 neutrons, and 7 electrons.
What is the mass number?
A. 14
B. 7
C. 0
D. 21

Sagot :

ROYADE

A-14

Explanation:

Mass number (MN) = Proton number + Neutron number

MN=7+7

MN=14

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