Consider the following table: | Compounds ( are monovalent surrounding atoms) |…

CHEMISTRY · Numerical · A Level · Chemistry · Bonding · Bonding

Problem

Consider the following table:

Compounds ( $X$ are monovalent surrounding atoms)	Central atoms ( $A$ to $D$ ) belong to group	Characteristics of compounds	Number of lone pair(s) at central atom
(i) $AX_{n_1}$	16	Planar and polar	$m_1$
(ii) $BX_{n_2}$	15	Trigonal pyramidal	$m_2$
(iii) $CX_{n_3}$	14	Zero dipole moment	$m_3$
(iv) $DX_{n_4}$	13	All $X-D-X$ bond angles are $120^\circ$	$m_4$

Then calculate the value of

\left|\frac{n_1+n_2+n_3+n_4}{m_1+m_2+m_3+m_4}\right|^2