Question

Which of the following statement(s) are true regarding electrons?

• A. They are negatively charged particles.
• B. Their relative mass is $\frac{1}{12}$ times that of a hydrogen atom.
• C. They are present at the center of an atom.
• D. Sir J. J. Thomson discovered electrons.

Answer 1

Answer: (A), (D)

The correct options are
A They are negatively charged particles.
D Sir J. J. Thomson discovered electrons.

Sir J. J. Thomson discovered electrons. These are negatively charged sub-atomic particles revolving around the nucleus of an atom in specific orbits. Their relative mass is $\frac{1}{1840}$ times that of a hydrogen atom.