Question

How to find the valency in x method

Answer 1

Answer:

Explanation:

The Octet Rule

When determining the valency of an atom or molecule (one for which you can't use the periodic table to determine valency), chemists use the octet rule. According to this rule, atoms and chemicals combine in such a way as to produce eight electrons in the outer shell of whatever compound it is they form. An outer shell with eight electrons is full, which means the compound is stable.

When an atom or molecule has from one to four electrons in its outer shell, it has a positive valency, meaning it donates its free electrons. When the number of electrons is four, five, six or seven, you determine the valency by subtracting the electron number from 8. That's because it's easier for the atom or molecule to accept electrons to achieve stability. All the noble gases – except for helium – have eight electrons in their outermost shells and are chemically inert. Helium is a special case – it is inert, but it has only two electrons in its outermost shell