Question

An ion X^-3 contains 18 electrons and 16 neutrons. Calculate the atomic number and mass number of the element X.

Answer 1

Answer:

Number of electrons in the neutral atom = 18 - 3 = 15. Now, for a neutral atom, Atomic number=Number of protons = Number of electrons. Mass number of the element=Number of protons + Number of neutrons. The given element Y with atomic number 15 is phosphorus