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:

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:

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

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.

explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.

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