Question

state why the valency of the metal potassium is +1 and the non-metal chlorine is -1. PLEASE GIVE AN EASY ANSWER​

Answer 1

Answer:

The number of electrons accepted by a non metal is called valency of the non metal. For example, one atom of chlorine accepts 1 electron to form a negative chloride ion (Cl–), so chlorine is a non-metal. Here because an atom of chlorine gains 1 electron so the valency of chlorine is 1.

Explanation:

Answer 2

From the Valency Theory we know that if an element gives its ion to another element its valency will be +(number of ions it gave). And the ion which got those ions will have -(number of ions it got).

For example:

Fluorine has 2,7 electrons. But the last orbit  is not complete (as it needs to be 8). valency = -1 (bcz i took 1 from other)

So it takes 1 electron from Sodium (2, 8, 1) (Sodium doesn't need the 1 electron that it has). Valency = +1 (bcz it gave other element its one electron)

In the same way Potassium's valency is +1 and Chlorine's valency is -1.

This was the explanation write the same in your words if it is for school work.