Question

An atom is represented by 2y X y identity the possible elements with such a representation till atomic number 20

Answer 1

Answer:  

Atomic configuration of element having atomic number-20 :    

   

1s2 , 2s2, 2p6, 3s2, 3p6, 4s2

WITH ATOMIC NUMBER 20 IS :CALCIUM

yes,

this element represented by 2y x y

calcium