Question

Who classify elemnts into block

Answer 1

Answer:

The elements belonging to Group 3 to 12 in the periodic table are called the d—block elements. In these elements the differentiating electron or the last electron enters into the penultimate or second outermost shell (n-1) d orbital.

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Answer 2

The elements belonging to Group 3 to 12 in the periodic table are called the d—block elements. In these elements the differentiating electron or the last electron enters into the penultimate or second outermost shell (n-1) d orbital. These elements have an outermost electronic configuration of (n-1) d¹⁻¹⁰ ns¹⁻².

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