If an atom has 10 protons and 12 neutrons, what is its mass number?
ChemistryClass 11CBSEAnswered 18 May 2026
Answer
The mass number is 22.
The mass number is the sum of protons and neutrons. In this case, 10 protons + 12 neutrons = 22.
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?