Give reason: Helium which is the first element of group 18 is placed in the p-block even though its last electron enters in s subshell.
Give reason:
Helium which is the first element of group 18 is placed in the p-block even though its last electron enters in s subshell.
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- Electronic configuration of helium is 1s2 which indicates that it has a stable electronic configuration i.e., a complete duplet.
- The p-block ends with group 18 which is a family of inert gases having stable electronic configuration (complete octet except helium).
- Therefore, helium is placed with group 18 elements in p-block due to its stable electronic configuration even though its last electron enters in s subshell.
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