Enter in order the abbreviations for the electron geometry (EG) and coordination number (CN) of the central atom for each substance

The expression for calculating the coordination number is shown below:

$Coordination number = no. of \sigma bond + no. of lone pair$

The structure of given compound is shown below:

The calculation of coordination number of central atom is shown below:

$\begin{array}{rcl}C.N. of central atom\left(O\right) & =& 3 + 1\\ & =& 4\end{array}$

In electronic geometry; lone pair also considered. So; the electron geometry of H₃O⁺ is tetrahedral.

The structure of given compound is shown below:

The calculation of coordination number of central atom is shown below:

$\begin{array}{rcl}C.N. of central atom\left(P\right) & =& 3 + 1\\ & =& 4\end{array}$

In electronic geometry; lone pair also considered. So; the electron geometry of P(NH₂)₃ is tetrahedral.