Question

The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is:​

Answer 1

no of electroon in A+ = 19 - 1 = 18.

Answer 2

Given

The number of protons in an atom of an element A = 19

To find

The number of electron in ion A+ .

Solution

The number of protons in an atom of an element A = 19

We know that the no of protons in an atom = the no of electrons

but here the charge of the ion is +1

therefore the no of electrons will be one less.

The number of electron in ion A+ = 19-1

                                                        = 18.

The no of electrons present in the ion A+ is 18.