- 1. Which subatomic particle has a positive charge?
A) Positron
B) Neutron
C) Electron
D) Proton
- 2. Which particle is responsible for chemical bonding?
A) Electron
B) Positron
C) Neutron
D) Proton
- 3. What is the atomic number equal to in an atom?
A) Number of electrons
B) Number of neutrons
C) Mass number
D) Number of protons
- 4. Which subatomic particle is involved in the process of beta decay?
A) Electron
B) Proton
C) Neutron
D) Positron
- 5. What is the term for an atom that has lost or gained electrons?
A) Molecule
B) Ion
C) Covalent
D) Isotope
- 6. How many electrons can occupy the first energy level of an atom?
A) 8
B) 1
C) 4
D) 2
- 7. Which scientist is credited with the discovery of the electron?
A) Marie Curie
B) Ernest Rutherford
C) J.J. Thomson
D) Niels Bohr
- 8. What happens to an atom when it gains an electron?
A) It becomes negatively charged
B) It becomes radioactive
C) It becomes a cation
D) It loses mass
- 9. In an atom, what is the relationship between the number of protons and electrons?
A) Variable
B) Electrons are greater
C) Equal
D) Protons are greater
- 10. What is the tendency of electrons to fill the lowest energy levels first called?
A) Hund's rule
B) Pauli exclusion principle
C) Electronegativity
D) Aufbau principle
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