Question

An element has atomic number 19 and mass number 39. How many electrons and protons are present in its unipositive ion?

Answer 1

Given:

Atomic number=19

Since atomic number = number of protons = number of electrons =19

Unipositive ion is obtained by removing an electron.

Therefore

number of protons = 19

number of electron = 19 – 1 = 18