Question

The element A belongs to second period and 17th group and the element B belongs to third period and second group of the periodic table
1) write the subshell electronic configuration of A

2) To which blocks does B belong? what is its valency?

3) Give the formula of the compound by A and B?

Answer 1

Answer:

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Electrons that are found in the outermost shell are generally known as valence electrons and the number of valence electrons determines the valency (or valence) of an atom.

The valencies of the elements belonging to the s-block and the p-block of the periodic table are generally calculated as the number of valence electron or eight minus the number of valence electrons.

For the d-block and f-block elements, valency is determined not only on the basis of valence electrons but also on d and f orbital electrons. However, the general valencies of these d and f block elements are 2 and 3.

The general oxidation state of the elements of the periodic table is illustrated in the chart provided below.

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see picture