Question:
The correct order of ionization energy of Cl, S, P, Al, Si is:
The correct order of ionization energy of Cl, S, P, Al, Si is:
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Ionization energy increases across a period due to increased effective nuclear charge and decreases down a group due to increased distance of the electron from the nucleus.
Updated On: Jan 23, 2026
- Cl>P>S>Si>Al
- Cl<P<S<Si<Al
- P>S>Cl>Si>Al
- S>P>Cl>Si>Al
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The Correct Option is A
Solution and Explanation
Step 1: General trend in ionization energy.
In general, ionization energy increases as we move from left to right across a period because the nuclear charge increases, making it harder to remove electrons.
Step 2: Applying the trend.
From left to right across the period: - Cl has the highest ionization energy because it is furthest to the right. - P and S have similar ionization energies, but P has slightly lower ionization energy than S due to its electron configuration. - Si and Al have lower ionization energies, with Al being the lowest.
Step 3: Conclusion.
The correct order of ionization energy is: Cl>P>S>Si>Al, which matches option (1).
In general, ionization energy increases as we move from left to right across a period because the nuclear charge increases, making it harder to remove electrons.
Step 2: Applying the trend.
From left to right across the period: - Cl has the highest ionization energy because it is furthest to the right. - P and S have similar ionization energies, but P has slightly lower ionization energy than S due to its electron configuration. - Si and Al have lower ionization energies, with Al being the lowest.
Step 3: Conclusion.
The correct order of ionization energy is: Cl>P>S>Si>Al, which matches option (1).
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