Explain the 4 blocks of the periodic table. how many, what are they, and what is strange about block "d"?

Answer and explanation;

An element block is a set of elements located in adjacent element groups.

There are four blocks; s, p, d, f; which originated from descriptions of spectroscopic lines of atomic orbitals: sharp, principal, diffuse and fundamental.

s-block; the first two groups of the periodic table, the s-block metals:

are either alkali metals or alkaline earth metals are soft and have low melting points are electropositive and chemically active

P-block elements include the last six element groups of the periodic table, excluding helium. The p-block elements include all of the nonmetals except for hydrogen and helium, the semi-metals, and the post-transition metals.

D-block elements are transition metals of element groups 3-12. D-Block elements:

have valence electrons in their two outermost and shells 'd' block elements behave in a manner that is somewhere between that of highly reactive electropositive alkali metals and the covalent compound forming elements.have high melting and boiling points  usually form colored salts are generally good catalysts

f-block; Inner transition elements, usually the lanthanide and actinide series, including lanthanum and actinium. These elements are metals which have:

high melting points variable oxidations states the ability to form colored salts

Uniqueness of group D elements; Normally across the period atomic radii should decrease. But d-block elements do not follow this trend. It increases From V to Cr and them remains constant and decreases and remains constant again.

D)can be increased in a closed system

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