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

asked Jun 22, 2023 52.5k views

15 votes

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

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2 votes

A-14

Step-by-step explanation:

Mass number (MN) = Proton number + Neutron number

MN=7+7

MN=14

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