Question

1)
In which group of elements of modern periodic table 'He' is placed?
a) Group 1
b) Group 2
c) Group 17
d) Group 18​

Answer 1

Answer:

d) Group 18

Explanation:

Elements are placed in groups according to their valence electrons and placed in periods according to the number of shells present in them. Helium has valence electrons equal to 2, but it is placed in group number 18 because it is a noble gas and has completely filled outermost shell.

Answer 2

Answer:

Group 18

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