Question

Element A has a valence shell configuration of ns2np4 while Element B has a valence 7 shell configuration of ns2np5 where n = energy level. Choose all of the following statements that are true regarding these elements assuming they are on the same period?

i. Element A is less electronegative then element B

ii. Element B has a lower first ionization energy then element A

iii. Element A has a more negative electron affinity then element B

iv. The atomic radius of element A is larger than element B

i and ii only

i and iii only

i and iv only

ii and iii only

ii and iv only

Answer 1

If they are on the same period then they will have same n value.

Inert gas will have ns2 np6 configuration.

Every element wants to achieve this configuration.

An element having ns2np5 configuration will want one electron and will have high electronegativity and high electron affinity.

An element having ns2np4 configuration will want to lose one electron to have half filled inert shell configuration. This will be less electronegative as compared to previous configuration. It will be easy to knock out one electron from ns2np4 configuration to get half filled. This configuration will be larger in size than ns2np5.

Thus correct options will be

i and iv