Question

Atom of which of the following does not contain all the sub atomic fundamental particles?
A. Lithium
B. Promethium
C. Helium
D. Protium ​

Answer 1

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Answer...

Your answer is D. Protium

It does not contain neutron. It contains only one electron and one proton.

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Answer 2

Answer:

D . protium

Explanation:

it contains only one electron's and one preton