there are 12 protons and 12 neutrons in the nucleus – Discussion Forum

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Ayushree

Asked: September 12, 2026In: Class 9 Science

In an atom, there are 12 protons and 12 neutrons in the nucleus. Now, imagine that all the electrons are replaced with some hypothetical particles that have the same charge as electrons but are 500 times heavier. What effect will this replacement have on the atom’s: (i) Atomic number (ii) Atomic mass (iii) Mass number (iv) Overall charge

Atomic number stays 12 since proton count is unchanged. Atomic mass increases slightly because the orbiting particles are heavier. Mass number remains 24 since nuclear nucleons are unchanged. Overall charge remains zero.