If two atoms have the same number of protons but different numbers of neutrons, what are they called?
ChemistryClass 11CBSEAnswered 18 May 2026
Answer
They are called isotopes.
Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons.
Suggested Q&A
Chemistry · Class 11- ChemistryClass 11What are elements, compounds, and molecules?
- ChemistryClass 112.8×10⁻³ mol of CO₂ is left after removing 10²¹ molecules from its ‘x’ mg sample. Find x. (Nₐ = 6.02×10²³ mol⁻¹)
- ChemistryClass 11Total number of isomers, considering both structural and stereoisomers of cyclic ethers with the molecular formula C₄H₈O is
- ChemistryClass 11What does 1s, 2s, 2p, 3s, 3p mean?
- ChemistryClass 11Why is it incorrect to say that an electron is 'stationary' in an atom?
- ChemistryClass 11Imagine you have an unknown element. What single piece of information about its subatomic particles would immediately allow you to identify the element?