Question

2. The mass of the nucleus is closest to A. 99% of that in the entire atom B. 1% of that in the atom C. 10–5 of that in the atom D. 10–15 of that in the atom

Answer 1

Answer: Option A) 99% of that in the entire atom

Explanation:

An atom consists of three subatomic particles named protons, neutrons and electrons. The protons and neutrons are found in the nucleus of the atom, while the mass of electrons is 1/1840 (negligible).

Thus, the mass of protons and neutrons in the nucleus makes 99% of the entire atom