Essentials of Radiologic Science Workbook Second Edition
Starla Mason Complete Solutions Latest 2026&2027 Exam
1. Which particle has a negative electrical charge?
A. Proton
B. Neutron
,C. Electron
D. Positron
Answer: C. Electron
Electrons carry a negative charge, whereas protons are positive and
neutrons have no electrical charge.
2. Which particle is found in the nucleus of an atom and has no
electrical charge?
A. Electron
B. Proton
C. Neutron
D. Positron
Answer: C. Neutron
Neutrons are electrically neutral particles located within the atomic
nucleus.
3. The atomic number of an element represents the number of:
A. Neutrons
B. Protons
C. Protons plus neutrons
D. Electrons plus neutrons
Answer: B. Protons
The atomic number is defined by the number of protons in the
nucleus.
4. The mass number of an atom equals the number of:
A. Protons only
B. Electrons and protons
,C. Protons and neutrons
D. Electrons and neutrons
Answer: C. Protons and neutrons
The mass number is the total number of nucleons: protons plus
neutrons.
5. Which atomic model describes electrons occupying specific
energy levels around the nucleus?
A. Bohr model
B. Dalton model
C. Thomson model
D. Rutherford scattering model
Answer: A. Bohr model
The Bohr model describes electrons as occupying specific energy
levels around the nucleus.
6. What happens when an atom loses an electron?
A. It becomes negatively charged
B. It becomes positively charged
C. Its atomic number decreases
D. Its nucleus becomes unstable immediately
Answer: B. It becomes positively charged
Loss of a negatively charged electron produces a net positive charge.
7. An atom that has gained or lost one or more electrons is called a:
A. Molecule
B. Isotope
C. Ion
D. Photon
, Answer: C. Ion
An ion is an atom or molecule with a net electrical charge resulting
from electron loss or gain.
8. Which term describes atoms of the same element that have
different numbers of neutrons?
A. Ions
B. Isotopes
C. Isomers
D. Molecules
Answer: B. Isotopes
Isotopes have the same number of protons but different numbers of
neutrons.
9. The energy required to remove an electron from an atom is
called:
A. Binding energy
B. Kinetic energy
C. Thermal energy
D. Mechanical energy
Answer: A. Binding energy
Binding energy represents the energy holding an electron within its
shell.
10. Which electron shell is closest to the nucleus?
A. K shell
B. L shell
C. M shell
D. N shell
Starla Mason Complete Solutions Latest 2026&2027 Exam
1. Which particle has a negative electrical charge?
A. Proton
B. Neutron
,C. Electron
D. Positron
Answer: C. Electron
Electrons carry a negative charge, whereas protons are positive and
neutrons have no electrical charge.
2. Which particle is found in the nucleus of an atom and has no
electrical charge?
A. Electron
B. Proton
C. Neutron
D. Positron
Answer: C. Neutron
Neutrons are electrically neutral particles located within the atomic
nucleus.
3. The atomic number of an element represents the number of:
A. Neutrons
B. Protons
C. Protons plus neutrons
D. Electrons plus neutrons
Answer: B. Protons
The atomic number is defined by the number of protons in the
nucleus.
4. The mass number of an atom equals the number of:
A. Protons only
B. Electrons and protons
,C. Protons and neutrons
D. Electrons and neutrons
Answer: C. Protons and neutrons
The mass number is the total number of nucleons: protons plus
neutrons.
5. Which atomic model describes electrons occupying specific
energy levels around the nucleus?
A. Bohr model
B. Dalton model
C. Thomson model
D. Rutherford scattering model
Answer: A. Bohr model
The Bohr model describes electrons as occupying specific energy
levels around the nucleus.
6. What happens when an atom loses an electron?
A. It becomes negatively charged
B. It becomes positively charged
C. Its atomic number decreases
D. Its nucleus becomes unstable immediately
Answer: B. It becomes positively charged
Loss of a negatively charged electron produces a net positive charge.
7. An atom that has gained or lost one or more electrons is called a:
A. Molecule
B. Isotope
C. Ion
D. Photon
, Answer: C. Ion
An ion is an atom or molecule with a net electrical charge resulting
from electron loss or gain.
8. Which term describes atoms of the same element that have
different numbers of neutrons?
A. Ions
B. Isotopes
C. Isomers
D. Molecules
Answer: B. Isotopes
Isotopes have the same number of protons but different numbers of
neutrons.
9. The energy required to remove an electron from an atom is
called:
A. Binding energy
B. Kinetic energy
C. Thermal energy
D. Mechanical energy
Answer: A. Binding energy
Binding energy represents the energy holding an electron within its
shell.
10. Which electron shell is closest to the nucleus?
A. K shell
B. L shell
C. M shell
D. N shell
