|
The noble gas that does NOT occur in the atmosphere is : |
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(a) |
Ne |
(b) |
Kr |
|
(c) |
He |
(d) |
Ra |
|
The noble gas that does NOT occur in the atmosphere is : |
|||
|
(a) |
Ne |
(b) |
Kr |
|
(c) |
He |
(d) |
Ra |