Chemistry
Grade-9
Easy

Question

An element with 1s2 configuration belongs to:

  1. Group 18
  2. Group 2
  3. Group 1
  4. Group 13

hintHint:

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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