Electronic configuration of an element with atomic number 15 is:

2, 8, 5

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2, 5, 8

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5, 2, 8

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8, 2, 5

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Solution

The correct option is A 2, 8, 5
The electronic configuration of an element with atomic number 15 will be 2, 8, 5. The 'k' shell has two electrons, 'l' shell has eight electrons and 'm' shell has 5 electrons respectively. This atom has 5 valence electrons.

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The electronic configuration of an element with atomic number (Z = 11) is 1s², 2s², 2p⁶, 3s¹. The symbol of the element is:

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