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Valence electron of helium enters to s subshell. But it is not s block element. Why? Is it a p block element? If so, why?
3 months ago

Answers : (2)

Arun
23013 Points
							
Block of an element is decided by the last subshell in which electron is entered according to aufbau principle. Since electronic configuration of He is 1s2 and last entered electron goes is s subshell hence helium belongs to s block.
3 months ago
Vikas TU
9484 Points
							
Dear student 
The valence electron of He is in s orbital , 
But its chemical property meet with that of p orbital So, 
It should be considered as p Block element 
But it is s Block element only 
 
3 months ago
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