JAMB Chemistry 2010 Objective — Question 6

Question 6 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

6. Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the A. decrease in screening effect B. increase in screening effect C. decrease in nuclear charge D. increase in nuclear charge

A. decrease in screening effect
B. increase in screening effect
C. decrease in nuclear charge
D. increase in nuclear chargeCorrect

Explanation

Across a period, the number of protons (nuclear charge) increases while shielding stays roughly constant, so the increase in nuclear charge causes ionization energy to rise.

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