Question

an atom of element X contains 15 electrons and 16 neutrons. State the mass number.

Answer 1

ANSWER is 31

Explanation:

the mass number= ( neutron no.+ proton no.)

the mass number=(neutron no.+ electron no.)

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Answer 2

it is 31. phosphorous has 15 protons, 15 electrons, and 16 neutrons.

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