The no of electrons, protons and neutron in a species are equal to 10,11,12 respectively. Assign proper symbol to the species.

Explanation

No.of protons = 11, hence atomic no. = 11
so the element is Na.
It has one electron less than the no. of electrons, hence
it has a unit +ve charge.
No. of neutrons = 12
Mass number= no. of protons + no.of neutrons = 11 + 12 = 23
therefore the symbol of that species`""_(11)^(23) Na+`