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Question

An atom of an element has one electron in the valence shell. It can be represented as :

A
6A12
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B
19A39
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C
13A27
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D
12A24
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Solution

The correct option is B 19A39
The atomic no. of A126 is 6. Its electronic configuration is 1s22s22p2. It has 4 electrons in valence shell.
The atomic no. of A3919 is 19. Its electronic configuration is 1s22s22p63s23p64s1. It has 1 electron in valance shell.
The atomic no. of A2713 is 13. Its electronic configuration is 1s22s22p63s23p1. It has 3 electrons in valence shell.
The atomic no. of A2412 is 12. Its electronic configuration is 1s22s22p63s2. It has 2 electrons in valence shell.
Therefore, the correct answer is option B.

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