why helium is present in p block since its valence electron is in s subshell
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due to its stable duplet and zero electronaffini ty and noble nature
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◆ The differentiating electron of Helium atom enters into s sub shell.
◆ so it must be placed in s block but Helium is a gas and s block elements are metals.
◆ so the properties of helium is different from s block elements.
◆ so it must not be placed in s block.
◆Helium is considered as a noble gas because of its negligible reactivity.
◆ the properties of helium is similar to the noble gases .
EXAMPLE : the electro affinity of helium and other noble gases is 0.
◆Hence it is placed in o group which has its position in p block.
hope this helps you.
☺REGARDS☺
◆ so it must be placed in s block but Helium is a gas and s block elements are metals.
◆ so the properties of helium is different from s block elements.
◆ so it must not be placed in s block.
◆Helium is considered as a noble gas because of its negligible reactivity.
◆ the properties of helium is similar to the noble gases .
EXAMPLE : the electro affinity of helium and other noble gases is 0.
◆Hence it is placed in o group which has its position in p block.
hope this helps you.
☺REGARDS☺
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