Which among the following is an incorrect option?
- AAtom is electrically neutral due to the presence of protons and electrons inside the nucleus.
- BElectrons are negatively charged and have negligible mass.
- CAtomic number is the number of protons in an atom of an element.
- DIsotopes are useful as nuclear fuel, in medical field, in carbon dating, etc.
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (a) Atom is electrically neutral due to the presence of protons and electrons inside the nucleus.
Explanation
An atom is electrically neutral because the number of protons (positive) equals the number of electrons (negative) – but electrons are NOT inside the nucleus; they revolve around it.
The nucleus contains protons and neutrons; so option (a) is incorrect, while the others are correct.