Answers

2016-02-23T22:15:13+05:30
a. z : 2,8,2 i.e. magnesium
b. x: 2 i.e. helium

i hope it helps.......... 
2 5 2
how answer a is magnesium
can you pls exaplain
coz 2,8,2 i.e.12 n atomic no.of magnesium is 12 only so that's y
thanx
ur welcome