Question

why iron is not s-block element if its valence electrons are 4S1 and 4S2.

Answer 1

Because iron is an transient element
it has an 4pΠ-DΠ (pie->Π)
Bonding mainly seen
so,
but in Group 1 that is s-block elements there no exchange of valence electrons takes place in its Bonding
Also its valency is not equal to 1

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