Question

how to find the valence of an element

Answer 1

Answer:

The valency of the atom of an element is determined by the number of electrons in its outermost shell, i.e. valence shell. For atoms with less than 4 or less electrons in the valence shells (i.e. valence electrons), valency = no. of electrons. For atoms with more than 4 valence electrons, valency = 8 - (no.

Answer 2

VALENCY -

• The ability of an atom to combine with other atoms.
• It is determined by the number of electrons present in the outermost shell of an atom.
• The valency of atoms,

- Containing 4 or less than 4 electrons in the outer shell, Valency = number of electrons in the valence shell.

- Containing more than 4 electrons in the outermost shell, Valency = Total electron number - number of electrons in the outermost shell.

• Atoms with 4 or less than 4 valence electrons tend to lose to attain stable configuration and are referred as atoms with positive valency.
• Negative valency atoms gain electrons to attain stable electronic configuration due to the presence of 5 to 7 electrons in the outermost shell.
• Example - Magnesium has atomic number 12 with 2 valence electrons in its valence shell. The atom will lose electrons to form a bond with the other atom showing positive valency.