What is the valency of oxide ion and sulphide ion?
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Solution
Valency:
It is the number of hydrogen atoms that combine directly or indirectly with one atom of an element.
Simply the capacity of an atom to lose, gain or share electrons to complete its octet configuration.
It is equal to the magnitude of the charge they carry.
It is a property of an atom in which valency has no sign.
It is the number of electrons of an atom which uses to combine with atoms of another element.
It is the combined power of an element.
In an atom, the valence electrons are the electrons that can be used in combining with other atoms. they are lying in the valance shells(orbitals of the outermost shell)
for example, Hydrogen has 1 electron, and its valency is one, one electron is needed to complete its outermost shell.
Find the valency for oxygen and sulphur:
The atomic number of oxygen is 8, and the atomic number of sulphur is 16. Both have the same number of valence electrons in their valence shell, 6.
By gaining two electrons, they attain the noble gas configuration. Hence, they have 2 valencies.