Question

how to calculate valency of nitrate

Answer 1

Nitrate ion (NO3) has one Nitrogen and three Oxygen atoms.

Oxygen lies in group 16 and thus has a valency of -2.

Nitrogen lies in the group 15 and has a charge of +5 forming the bond with three oxygen atoms.

5 – 3*(2) = -1

So if you add the valency of all the atoms, you get the answer as -1.

Answer 2

Valency

The ability of an atom or molecule to combine is referred to as valency. There are several methods for determining the valency of an atom, and they are as follows:

1. The periodic table is made up of components that are organised in such a way that the valency of a given element can be determined.
2. Valency from a chemical formula is determined by the octet rule, and the valency can be determined by examining the combining of an element.
3. When the outermost shell of a compound has eight electrons, it is said to be stable according to the octet rule. If the number of electrons in the outer shell is between one and four, the substance is said to have positive valency. For compounds with electrons four, five, six, or seven, the valency is calculated by subtracting the electron from eight.

To determine the valency of nitrate $(NO_{3} ^{-} )$

1. The nitrate ion is composed of three oxygen and one nitrogen atom.
2. Nitrogen forms bonds with three oxygen atoms with +5 charge.
3. Oxygen has a valency of $-2$.
4. So, the valency of nitrate is calculated by,

$5+(3\times-2)=5-6=-1$

Hence, the valency of nitate ion is $-1$.

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