Question

Of the following compounds, which or which of them have a pair of free electrons in the central atom?
I. SO3
II. H2O
III. NH4 +


It would really nice if someone could clarify all three
plz! plz!! plz!!! and thanks​

Answer 1

Explanation:

1. SO3 : The central atom of SO3 is Sulphur. The valance electron number of Sulphur is 6. So, it makes 3 double bond with 3 O atoms. So, there is no lone pair electron in SO3.
2. H2O: The central atom of H2O is Oxygen. The valance electron number of Oxygen is 6 and its valency is 2. So it makes 2 single bond with two Hydrogen atoms. So, it has 2 lone pair electron in its valance cell.
3. NH4+: The valance electron number of Nitrogen is 5 and its valency is 3. So, it makes 3 single bond with three Hydrogen atoms and shares its lone pair electron with another Hydrogen atom to form dative bond. So, there is no lone pair electron.