Question

the electronic configuration of three elements X,Y and Z are given below: X=2 Y=2,6 and Z=2,8,2. which element belongs to (I)second period (ii) second group (iii) eighteenth group? (with reason)​

Answer 1

Answer:

1. Y is the element belong to second period because it has 2nd shell as it's valence shell ( outermost shell)

2. Z is the element belong to second group because it's valence shell's electrons are 2

3. X is the element belong to eighteenth group as it is the atomic number of helium

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