Which order of ionization energy is correct ans. Mg > Al Si > P Si = P Mg < Al

To determine the correct order of ionization energy, we need to consider the general trends in the periodic table. Ionization energy tends to increase across a period (from left to right) and decrease down a group (from top to bottom).

Analysis of Each Comparison

1. Mg > Al:

   • Magnesium (Mg) is in Group 2, while Aluminium (Al) is in Group 13. Generally, as you move from a Group 2 element to a Group 13 element, the ionization energy decreases due to the increase in size and effective nuclear charge. Thus, this statement is incorrect.

2. Si > P:

   • Silicon (Si) is in Group 14 and Phosphorus (P) is in Group 15. The ionization energy generally increases across a period, but comparing these two, phosphorus has a slightly lower ionization energy than silicon due to its half-filled p subshell being less stable. Hence, this is also incorrect.

3. Si = P:

   • This states that the ionization energies are equal, which is also incorrect based on the above explanation.

4. Mg < Al:

   • This implies Aluminium has a lower ionization energy than Magnesium, which we previously established is accurate. Consequently, this statement is correct.

Final Answer

The correct order of ionization energy is Mg < Al.