Question

State one observation which shows that atom is not indivisible

Answer 1

Answer: One observation which shows that atom is not divisible is that in modern atomic theory it states that atoms are divisible into sub-atomic particles like protons, electrons and neutrons.

Explanation:

Answer 2

Answer:

Chadwick discovered neutral particles present in an atom by bombarding light nuclei like beryllium with alpha particles, i.e. helium nuclei.

4Be9 + 2He4 → 6C12 + 0n1

Discovery of the neutron also showed that an atom is divisible.