📚CHEMISTRY EUEE QUESTIONS
1. The first atomic theory was proposed by:
(A) Niels Bohr
(B) Ernest Rutherford
(C) John Dalton
(D) J.J. Thomson
2. Dalton's atomic theory stated that all atoms of a given element are:
(A) Different in size
(B) Different in mass
(C) Identical in mass and properties
(D) Composed of smaller particles
3. Who discovered the electron?
(A) Ernest Rutherford
(B) James Chadwick
(C) J.J. Thomson
(D) Max Planck
4. Thomson's atomic model is known as the:
(A) Nuclear model
(B) Planetary model
(C) Plum pudding model
(D) Quantum mechanical model
5. Rutherford's gold foil experiment led to the discovery of the:
(A) Electron
(B) Neutron
(C) Nucleus
(D) Proton
6. Rutherford's atomic model proposed that the atom is mostly:
(A) Solid
(B) Liquid
(C) Empty space
(D) Filled with electrons
7. Which particle is NOT found in the nucleus of an atom?
(A) Proton
(B) Neutron
(C) Electron
(D) Nucleon
8. The atomic number of an element represents the number of:
(A) Neutrons in the nucleus
(B) Protons in the nucleus
(C) Electrons in the outermost shell
(D) Total number of particles in the nucleus
9. Isotopes of an element have the same number of:
(A) Neutrons
(B) Protons
(C) Mass number
(D) Both protons and neutrons
10. Who proposed that electrons orbit the nucleus in specific energy levels or shells?
(A) Ernest Rutherford
(B) J.J. Thomson
(C) Niels Bohr
(D) Max Planck
11. Bohr's atomic model successfully explained the:
(A) Spectra of all elements
(B) Spectra of hydrogen
(C) Existence of isotopes
(D) Wave nature of electrons
12. In Bohr's model, electrons can move to a higher energy level by:
(A) Emitting energy
(B) Absorbing energy
(C) Colliding with other electrons
(D) Moving closer to the nucleus
13. The quantum mechanical model of the atom treats electrons as:
(A) Particles only
(B) Waves only
(C) Both particles and waves
(D) Neither particles nor waves
14. Which principle states that it is impossible to know both the exact position and momentum of an electron simultaneously?
(A) Pauli Exclusion Principle
(B) Hund's Rule
(C) Heisenberg Uncertainty Principle
(D) Aufbau Principle
15. Atomic orbitals are regions of space where there is a high probability of finding:
(A) Protons
(B) Neutrons
(C) Electrons
(D) The nucleus
16. Which quantum number describes the shape of an atomic orbital?
(A) Principal quantum number (n)
(B) Azimuthal quantum number (l)
(C) Magnetic quantum number (ml)
(D) Spin quantum number (ms)
17. The maximum number of electrons that can occupy a p subshell is:
(A) 2
(B) 4
(C) 6
(D) 10
18. Which rule states that electrons will individually occupy each orbital within a subshell before doubling up in any one orbital?
(A) Pauli Exclusion Principle
(B) Hund's Rule
(C) Heisenberg Uncertainty Principle
(D) Aufbau Principle
19. According to the Aufbau principle, electrons fill orbitals in order of:
(A) Increasing energy
(B) Decreasing energy
(C) Increasing atomic number
(D) Decreasing atomic number
20. What does the Pauli Exclusion Principle state?
(A) Electrons must fill the lowest energy levels first
(B) No two electrons in the same atom can have the same set of four quantum numbers
(C) Electrons must occupy each orbital within a subshell individually before pairing up
(D) It is impossible to know both the exact position and momentum of an electron simultaneously
Answers:
1. C
2. C
3. C
4. C
5. C
6. C
7. C
8. B
9. B
10. C
11. B
12. B
13. C
14. C
15. C
16. B
17. C
18. B
19. A
20. B
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