Question

A neutral atom whose electron configuration is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^6$ is:

• A. highly reactive
• B. a noble gas
• C. a positively charged ion
• D. a transition metal
• E. a lanthanide element

Answer 1

The correct option is B a noble gas

As all the orbitals are filled in the given element, it must be a noble gas and must be highly unreactive, The given configuration is of ${}_{54}Xe$ which is a noble gas.