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