Structure of Atoms (Protons, Neutrons, Electrons) MCQs

1. What is the charge of a proton?
(A) Positive
(B) Negative
(C) Neutral
(D) Varies with atoms

2. Where are electrons located in an atom?
(A) Inside the nucleus
(B) Orbiting the nucleus
(C) In the neutron cloud
(D) Mixed with protons

3. Which subatomic particle is electrically neutral?
(A) Proton
(B) Electron
(C) Neutron
(D) Positron

4. What determines the atomic number of an element?
(A) Number of neutrons
(B) Number of electrons
(C) Mass number
(D) Number of protons

5. What is the relative mass of an electron compared to a proton?
(A) Equal
(B) Half
(C) About 1/1836
(D) About 1836 times greater

6. The nucleus of an atom contains:
(A) Only protons
(B) Only electrons
(C) Protons and neutrons
(D) Electrons and neutrons

7. Which particle orbits the nucleus in energy levels or shells?
(A) Neutron
(B) Electron
(C) Proton
(D) Nucleon

8. The total number of protons and neutrons in an atom is called its:
(A) Atomic number
(B) Mass number
(C) Atomic mass
(D) Valency

9. In a neutral atom, the number of electrons is equal to the number of:
(A) Neutrons
(B) Nucleons
(C) Protons
(D) Quarks

10. Which of the following statements is true?
(A) Neutrons and protons have approximately the same mass
(B) Electrons are heavier than protons
(C) Protons are heavier than neutrons
(D) Electrons are located in the nucleus