(a) 4H+(aq) + So,-(aq) + 2Nal(s) 2Na+(aq) + L(s) + SO,(g) + 2H,0(1) 2HF(aq) + BaSO,(s) (b) BaF,(s) + 2H*(aq) + SO,?-(aq) -

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d-Block Elements

According to the modern form of periodic table, 118 elements are present which are subdivided as four blocks, namely, s, p, d and f-block elements based on the entry of the valence electron or last electron into which orbital.