Multiple choice

Arrange the elements Cl, Al, Na and S in the decreasing order of their ionisation potential.

  1. Na > Al > S > Cl

  2. Cl > Al > S > Na

  3. Na > S > Al > Cl

  4. Cl > Na > S > Al

  5. Cl > S > Al > Na

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The third period in the modern periodic table consists of the elements sodium, magnesium, aluminium, silicon, phosphorous, sulphur, chlorine and argon, in that order. The given elements belong to the third period. As we move from left to right of a period, the ionisation potential increases. Hence, sodium has the least ionisation potential and chlorine has the highest. So, the fifth option is correct.

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