Question

question 4 of 10
which of the following ideas about the atom changed when new evidence was discovered?
a. atoms cannot be divided.
b. all matter is made up of atoms.
c. elements are different kinds of atoms.
d. atoms are made up of smaller particles.

Explanation:

• Option A:
• Initially, it was thought that atoms were indivisible (like in Dalton's atomic theory). But with the discovery of sub - atomic particles (electrons by J.J. Thomson, protons, and neutrons), the idea that atoms cannot be divided changed.
• Option B:
• The concept that all matter is made up of atoms has been a fundamental and widely - accepted idea for a long time. New evidence about atoms (like sub - atomic particles) did not change this basic tenet.
• Option C:
• The understanding that elements are different kinds of atoms has been a core part of atomic theory. Sub - atomic particle discoveries did not alter this concept.
• Option D:
• This is actually a result of new evidence (discovery of sub - atomic particles). It is not an idea that was changed but rather an idea that was developed as new evidence emerged.

Answer:

A. Atoms cannot be divided.