Question

How is the valency of an element decided ? explain with examples​

Answer 1

Hey mate here is your answer

✏ The combining capacity of an atom is called its Valency.

Answer 2

Answer:

• When we know the atomic number of an element we can calculate its valency easily.
• There are shells or energy levels in which the electrons are placed namely "k, l, m, n".
• The different energy levels have “different number of electrons” in the first energy level is K, the second is L, third is M and so on.
• After distributing the electrons in energy levels the “number of electrons” in outermost shell should be considered and subtracted from 8.
• Since 8 is a stable configuration and subtracting the number of electrons from 8 will give the valency.