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JAMB Chemistry 2010 Question 6

Question 6

Periodic Table

Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the

  1. A.decrease in nuclear charge
  2. B.increase in nuclear charge
  3. C.decrease in screening effect
  4. D.increase in screening effect
Show the answer and explanation

Answer: B (increase in nuclear charge)

Explanation

Across a period the number of protons rises while electrons enter the same shell, so the outer electrons are held more tightly.