Which among the following is an incorrect option?

Asked in BPSC Prelims Exam 67th Cancelled · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)

1. Atom is electrically neutral due to presence of protons and electrons inside the nucleus.
2. Electrons are negatively charged and have negligible mass.
3. Atomic number is the number of protons in an atom of an element.
4. Isotopes are useful as nuclear fuel, in medical field, in carbon dating, etc.

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