Chemistry
Grade-9
Easy
Question
An element with 1s2 configuration belongs to:
- Group 18
- Group 2
- Group 1
- Group 13
Hint:
He has different configuration than other nobles gases.
The correct answer is: Group 18
- Group 18 generally has 2p6 configuration but in He its configuration is 1s2.
- Group 2 has ns2 where n is not equal to 1.
- Group 1 has configuration ns1.
- Group 13 has configuration np1.
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