pBlock ElementsII 2 Question 1
1. The noble gas that does not occur in the atmosphere is
(2019 Main, 10 April II)
(a) $\mathrm{Ra}$
(b) $\mathrm{Kr}$
(c) $\mathrm{He}$
(d) $\mathrm{Ne}$
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Solution:
- Radium (Ra) is a radioactive element. Ra belongs to group 2 (alkaline earth metals), it is not a noble gas.
Note In question noble gas which does not exist in the atmosphere is asked and answer is Ra. But Ra (radium) is an alkaline earth metal and not noble gas. It can be Rn (radon) and is misprint in JEE Main Paper
