Valency can be compared to the arms or hands of an atom. Just as a person with two arms can hold hands with two others, an atom with a valency of two can form bonds with two other atoms.
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Valency helps in determining how atoms of different elements will combine to form chemical compounds. It indicates the number of bonds an atom can form with other atoms, facilitating the writing of chemical formulas.
NCERT Class 3 English Textbook Santoor Question Answers Page No. 3 Question no. 1 National Education Policy 2020, NEP 2020
Valency, also known as combining power, is the measure of the number of atoms of hydrogen or any other monovalent element with which an atom of the element combines, or for which it can be substituted or with which it ...
Polyatomic ions consist of multiple atoms bonded together, whereas single-charged ions are either single atoms or simple molecules with a net charge.