Seudónimo Seudónimo 28-08-2019 Chemistry contestada Write down the a) electronic configuration b) no. of valence electrons c) no. of penultimate shell electrons for the following elements 1. X (Mass no - 12, Atomic No-6) 2.Y (Mass no- 20, Atomic No- 10) 3.Z (Mass no- 39, Atomic No- 19) Thanks.
