Free s-Block and p-Block Elements MCQs with Answers
21 s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Periodic Properties and TrendsBlocks of the Periodic TableReactions of Group I ElementsReactions of Group II ElementsReactions of Group IV Elements
21 questions · page 3 of 3
21. The element with smallest value of ionization energy is
- A. Li
- B. Al
- C. Ca
- D. Ba
Explanation: Ionisation energy falls down a group as the outer electron lies further from the nucleus and is better shielded, and barium is the lowest of these four in the periodic table. Lithium is small and holds its outer electron tightly by comparison. Across a period the trend runs the other way, which is why aluminium is not the answer despite being a metal.
Correct answer: Ba