Question

Which of the following series correctly represents relations between the elements from X to Y?
$X\to Y$

• A. ${}_{6}C{\to }_{32}Ge$ Atomic radii increases
• B. ${}_{3}Li{\to }_{19}K$ Ionization enthalpy increases
• C. ${}_{9}F{\to }_{35}Br$ Electron gain enthalpy with negative sign increases
• D. ${}_{18}Ar{\to }_{54}Xe$ Noble character increases

Answer 1

The correct option is A ${}_{6}C{\to }_{32}Ge$ Atomic radii increases

The correct relations between the elements from X to Y are as shown below.
(A) ${}_{6}C{\to }_{32}Ge$ Atomic radii increases. Two additional shells of electrons are added.
(B) ${}_{3}Li{\to }_{19}K$ Ionization enthalpy decreases. With increase in the atomic number, the atomic size increases and the valence electrons are loosely held . Hence, the ionization energy decreases on moving down the group.
(C) ${}_{9}F{\to }_{35}Br$ Electron gain enthalpy with negative sign decreases. With increase in the nuclear charge, the attraction of the nucleus for the valence electrons decreases.
(D) ${}_{18}Ar{\to }_{54}Xe$ Noble character decreases. Xe has much more compounds than Ar.