Question

Define valency and its trends

Answer 1

The valency of an atom is the no of electrons it has in its outermost shell or the number of atom required to complete the outermost shell

its trend is modern periodic table ...

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Answer 2

Valency. One of the trends in the modern periodic table is that of the valency of an atom. As you already know, the valency of an atom is the number of electrons it has in its outermost shell or the number of atoms in requires to complete its outermost shell.