Question:
The first ionization enthalpies of the elements X, Y, Z of the second period are 899, 1402, 520 kJ/mol respectively. X, Y, Z respectively are:
The first ionization enthalpies of the elements X, Y, Z of the second period are 899, 1402, 520 kJ/mol respectively. X, Y, Z respectively are:
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Ionization enthalpy generally increases across a period and decreases down a group in the periodic table.
Updated On: Mar 12, 2025
- Li, B, N
- Be, N, Li
- Be, Li, N
- Li, N, Be
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The Correct Option is B
Solution and Explanation
Step 1:
Ionization enthalpy increases as we move across a period (from left to right) and decreases as we move down a group in the periodic table.
Step 2:
From the given values:
- 899 kJ/mol corresponds to the element with the highest ionization enthalpy, which is Be.
- 1402 kJ/mol corresponds to the element with the second-highest ionization enthalpy, which is N.
- 520 kJ/mol corresponds to the element with the lowest ionization enthalpy, which is Li.
Thus, the correct order is Be, N, Li.
Ionization enthalpy increases as we move across a period (from left to right) and decreases as we move down a group in the periodic table.
Step 2:
From the given values:
- 899 kJ/mol corresponds to the element with the highest ionization enthalpy, which is Be.
- 1402 kJ/mol corresponds to the element with the second-highest ionization enthalpy, which is N.
- 520 kJ/mol corresponds to the element with the lowest ionization enthalpy, which is Li.
Thus, the correct order is Be, N, Li.
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