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