Which of the following was NOT among Democritus's ideas?

A) Matter consists of tiny particles called atoms.

B) Atoms are indivisible.

C) Atoms retain their identity in a chemical reaction.

D) Atoms are indestructible.

Answer is: C) Atoms retain their identity in a chemical reaction.

Democritus (c. 460 - c. 370 BC) was an Ancient Greek philosopher.

According to his atomic theory:

1) everything is composed of atoms.

2) atoms are physically indivisible.

3) there is empty space between atoms.

4) atoms are indestructible and in motion.

5) there is an infinite number of atoms, which differ in shape and size.

Answer : Option C) Atoms retain their identity in a chemical reaction. Explanation:

Democritus idea of atom was -

Everything is composed of atoms and they are indivisible;

They have empty space between them also they are indestructible, and are always in motion.

This clearly states that atoms identity retention was not described by Democritus.