Element having atomic no.of 56 belongs to which of the following block

Element having atomic no.of 56 belongs to which of the following block of periodic table

(a) p-block
(b) d-block
(c) f-block
(d) s-block

s-block

Consider Barium having atomic number 56

It’s electronic configuration is 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶6s²

It contain 2 electrons in the valence shell, hence it is placed in 2 group of the periodic table that means s-block element.

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