Question

name the correct representation of the element X which contains 15 electrons and 15 neutrons
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Answer 1

Answer:

Phosphorus is the element X

Answer 2

Answer:

Atomic mass = protons + neutrons

protons = electrons

ATOMIC MASS = 15 + 15 = 30 u

ATOMIC NUMBER = PROTONS = 15

³⁰ X and 15 will be in subscript.