Pblock Elementsii Result Question 1
The noble gas that does not occur naturally in the atmosphere is
(a) $\mathrm{Ra}$
(b) $\mathrm{Kr}$
(c) $\mathrm{He}$
(d) $\mathrm{Ne}$
(2019 Main, 10 April II)
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Answer:
Correct Answer: 1. ( a )
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).
BETA
