The elements with atomic numbers 10, 18, 36, 54 and 86 are:
Correct answer: B. Inert gases
- A. Light metals
- B. Inert gases
- C. Halogens
- D. Rare earth metals
Explanation
Option B is correct as Inert gases or Noble gases have their stable electronic subshell configurations. (ns2 np6 ) Hence, we can predict their atomic numbers as He has only K she'll so it's having 2 as the atomic number. Similarly, Ne has K(2 electrons) and L (8 electrons) having atomic number 10. In the same manner, we may predict the atomic number of Ar as it has K (2 electrons), L (8 electrons) and M shell (8 electrons) thus, having atomic number 18. Thus, all other options are rendered as incorrect.
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