What are isobars?
Elements with different atomic number but same mass number
Correct Answer: Option 2 – Elements with different atomic number but same mass number
What are isobars?
Isobars are atoms of different elements that have the same mass number but different atomic numbers.
Key idea:
Same mass number (A): Total number of protons + neutrons is the same
Different atomic number (Z): Number of protons is different, so they are different elements
Example:
Argon: ₁₈⁴⁰Ar → 18 protons, mass number 40
Calcium: ₂₀⁴⁰Ca → 20 protons, mass number 40
Both have the same mass number but are different elements.
Quick comparison:
Isotopes: same element, different mass number
Isobars: different elements, same mass number
Important Questions from Structure of Atom
Identify the element having zero valency
The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?
What is the atomic number of nitrogen?
Which of the following metals is the most reactive element?
