Question

Statement I: The ionization energy generally increases as you move from left to right across the periodic table.
Statement II: Shielding increases as you move from left to right across the periodic table.

• A. Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.
  
• B. Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.
  
• C. Statement I is correct, but Statement II is incorrect.
  
• D. Statement I is incorrect, but Statement II is correct.
  

Answer 1

Answer: (A)

Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.

Option $A$ is the correct answer.

As one goes from left to right of a periodic table, the nuclear force of attraction on the outer most electrons increases, because the number of outer electrons as well as protons increases. Since, the nuclear force of attraction increases, it becomes gradually difficult to take out an electron from the outermost orbit or ionize them. Thus, the ionization energy increases gradually.

From left to right, since the number of outermost electrons increases, and shielding also increases. Shielding depends on the number of outer electrons