Chemistry · Atomic Structure
Atoms A and B have atomic numbers 20 and 18 respectively, and both have a mass number of 40. Which one of the following correctly describes the relationship between A and B?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
Share:
- 1A and B are isotopes because they have different atomic numbers
- 2A and B are isobars because they have the same mass number but different atomic numbers✓
- 3A and B are identical elements because they have the same mass number
- 4A and B must have the same number of protons but different numbers of neutrons
Correct answer
A and B are isobars because they have the same mass number but different atomic numbers
Download Single Question PDF
Save this question and verified answer as a clean study sheet with live clickable link.
👥
Share with Friends & Study Groups
Challenge your peer aspirants on WhatsApp or Telegram to solve this question!
Online Test Series
Start Free Mock Test →Preparing for Chemistry?
Practice full-length mock tests with real exam timers, instant score analysis, and all-India ranking.
Chapter Practice
Practice Atomic Structure MCQs →Want more practice questions on Atomic Structure?
Solve complete topic-wise tests with detailed solutions on GkGet.
Related Practice Questions
Recommended practice questions in Chemistry · Atomic Structure