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Modern Periodic Table

An element X ...

Question

An element X belongs to the 3rd period and group 15 of the modern periodic table. What is the atomic number of element X?

A

15

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B

7

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C

3

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D

18

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Solution

The correct option is A 15
The element X belongs to the 3rd period and group 15. So, the number of shells present in the atom will be three, and five electrons will be present in its valence shell. Therefore, the electronic configuration will be 2, 8, 5.
And, atomic number of X $= 2 + 8 + 5 = 15.$

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