Question

Is it necessary to write) valency positive or negative?

Answer 1

Yes it is necessary to write valency positive or negative if you will not write it how will you know that which ion it is cation or anion

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Answer 2

$\huge\bf{\orange{\mid{\overline{\underline{Answer: Yes.}}}\mid}}$

$\huge\bf{\blue{\mid{\overline{\underline{Explanation}}}\mid}}$

It is necessary to write valency of elements as a positive and a negative because it gives us information about the ions on the elements. If any element has valancy 1+, it is cation. If any elements has valancy 1-, it is anion.

$\huge\bf{\green{\mid{\overline{\underline{Example:}}}\mid}}$

Potassium has a valancy of (K+). It's valancy is (1+). So, it is cation.

Hydroxide has a valency of (OH-). It's valancy is (1-). So, it is anion.