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Element with atomic number 15 and mass number 31 is present in

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group 15 and period 3

group 15 and period 4

group 5 and period 4

group 5 and period 3

answer is C.

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Detailed Solution

The element with atomic number 15 and mass number 31 is phosphorus (P). It is located in:

Correct Answer: Group 15 and Period 3.

Explanation:

Group 15: Phosphorus belongs to Group 15 because it has 5 valence electrons (ns²np³ configuration).
Period 3: Its outermost electrons are in the third energy level (3s and 3p orbitals).

Thus, phosphorus is in Group 15 and Period 3 of the periodic table.

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