what is the valency of potassium and calcium
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The valency of potassium is 1 and the valency of calcium is 2.
Explanation:
The valency of potassium is +1 and the valency of calcium is +2.
Potassium is a first group element, or alkali earth metal, and the entire group has a valency of +1. Calcium is a second group element, or alkaline metal, and the entire group has a valency of +2.
Potassium and calcium have 1 and 2 valence electrons in their outermost shells, respectively. The octet rule states that if the outermost shell has less than 4 electrons, the number of electrons is equal to the valency.
Valency is a measure of the ability of an atom to bond with other atoms. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.