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The electronic configuration of three elements are given below:

x 2
y 2,6
z 2,8,2
1) Which elements belongs to the second period of the periodic table?
2) Which elements belong to the eighteenth group of the periodic table?


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
ur welcome
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