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Question

Which of the following are true for an element?

A
Atomic number = number of protons + number of electrons
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B
Mass number = number of protons + number of neutrons
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C
Atomic mass = number of protons = number of neutrons
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D
Atomic number = number of protons = number of electrons
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Solution

The correct option is B Mass number = number of protons + number of neutrons
Mass number = number of protons + number of neutrons

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