AP Chemistrymediummcq1 pt
Which particle is largest: K⁺, Cl⁻, or Ar?
A.Cl⁻
B.K⁺
C.Ar
D.All are equal
Explanation
Core Concept
All three are isoelectronic (18 electrons), so size follows nuclear charge: the fewest protons gives the largest radius. Chloride's 17 protons pull the electrons in least, making Cl⁻ the biggest; K⁺ (19 protons) is smallest.
Correct Answer
ACl⁻
More Unit 1: Atomic Structure and Properties practice questions
- mediumWhy does atomic radius decrease across a period from Li to F?
- easyWhich element has the largest atomic radius: S, Se, or Te?
- easyWhich orbital diagram for carbon's 2p subshell is correct (arrows represent electrons)?
- mediumA 34.0 g sample of NH₃ contains how many moles of hydrogen atoms?
- mediumHow many atoms are in 9.0 g of water (molar mass 18.0 g/mol)?
Practice more AP Chemistry questions with full explanations
Practice Unit 1: Atomic Structure and Properties Questions →