Question:medium

Write the atomic number of the element present in the third period and seventeenth group of the periodic table.

Updated On: Jan 20, 2026
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Solution and Explanation

Identify the Element

  • Third period elements: Na, Mg, Al, Si, P, S, Cl, Ar.
  • Group 17 elements (halogens): F, Cl, Br, I, At, Ts.
  • Common element in both lists: Chlorine (Cl).

Atomic Number

Chlorine (Cl) has atomic number 17.

Final Answer

The atomic number of the element in the third period and seventeenth group is 17.

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