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Question

Fill in the blanks by picking the correct option.
There are ________  groups and_________ periods in the extended form of periodic table. The group, all members of which are in gaseous state under ordinary conditions is_____ group.Most electropositive elements belong to ______ group.


A
16,8,17,2
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B
18,7,18, 1
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C
8,7,0,2
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D
16,8,18,1
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Solution

The correct option is A 18,7,18, 1
There are 18 groups and 7 periods in the periodic table. All members of the 18th group (He, Ne, ar, Kr, Xe, Rn) are noble gases and the first group contains alkali metals (Li, Na, K, Rb, Cs) which are the most electropositive.

Chemistry

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