LRA 211 FINAL REVIEW QUESTIONS
AND ANSWERS WITH VERIFIED
SOLUTIONS 100% CORRECT!!!
1. Who discovered the electron?
Answer: ✔✔ J.J. Thomson
Explanation:
J.J. Thomson is credited with the discovery of the electron in 1897 through
his experiments with cathode rays. He concluded that the rays were made up
of tiny negatively charged particles, which he called corpuscles, later
renamed electrons.
2. The earliest atomic theory based on an arrangement similar to the solar
system is attributed to:
Answer: ✔✔ Rutherford
Explanation:
Ernest Rutherford proposed the first model of the atom that resembled the
solar system, with electrons orbiting a central nucleus. This was based on
his gold foil experiment in 1911, which led him to conclude that atoms have
a small, dense nucleus surrounded by mostly empty space.
3. What are the three fundamental particles of the atom?
Answer: ✔✔ Proton, neutron, and electron
Explanation:
The three fundamental particles that make up an atom are:
o Protons: Positively charged particles found in the nucleus.
o Neutrons: Neutral particles (no charge) also located in the nucleus.
o Electrons: Negatively charged particles that orbit the nucleus.
, 4. What does the atomic nucleus contain?
Answer: ✔✔ Protons and neutrons
Explanation:
The atomic nucleus is the dense, central part of an atom. It contains protons
(positively charged) and neutrons (neutral), which together account for
most of the atom's mass.
5. What is the component of the nucleus that has a positive charge and mass?
Answer: ✔✔ Proton
Explanation:
Protons are the positively charged particles found in the nucleus of an atom.
They have mass and are essential in determining the atomic number and
identity of an element.
6. What is the component of the nucleus that has mass but no electrical
charge?
Answer: ✔✔ Neutron
Explanation:
Neutrons are neutral particles (no charge) found in the nucleus. They have a
mass similar to protons and help stabilize the nucleus by offsetting the
repulsive forces between the positively charged protons.
7. When an atom has more electrons than protons, it will have:
Answer: ✔✔ A negative charge
Explanation:
An atom with more electrons than protons becomes negatively charged,
forming an anion. This is because electrons carry a negative charge, and
when there are more electrons than protons, the overall charge of the atom
becomes negative.
AND ANSWERS WITH VERIFIED
SOLUTIONS 100% CORRECT!!!
1. Who discovered the electron?
Answer: ✔✔ J.J. Thomson
Explanation:
J.J. Thomson is credited with the discovery of the electron in 1897 through
his experiments with cathode rays. He concluded that the rays were made up
of tiny negatively charged particles, which he called corpuscles, later
renamed electrons.
2. The earliest atomic theory based on an arrangement similar to the solar
system is attributed to:
Answer: ✔✔ Rutherford
Explanation:
Ernest Rutherford proposed the first model of the atom that resembled the
solar system, with electrons orbiting a central nucleus. This was based on
his gold foil experiment in 1911, which led him to conclude that atoms have
a small, dense nucleus surrounded by mostly empty space.
3. What are the three fundamental particles of the atom?
Answer: ✔✔ Proton, neutron, and electron
Explanation:
The three fundamental particles that make up an atom are:
o Protons: Positively charged particles found in the nucleus.
o Neutrons: Neutral particles (no charge) also located in the nucleus.
o Electrons: Negatively charged particles that orbit the nucleus.
, 4. What does the atomic nucleus contain?
Answer: ✔✔ Protons and neutrons
Explanation:
The atomic nucleus is the dense, central part of an atom. It contains protons
(positively charged) and neutrons (neutral), which together account for
most of the atom's mass.
5. What is the component of the nucleus that has a positive charge and mass?
Answer: ✔✔ Proton
Explanation:
Protons are the positively charged particles found in the nucleus of an atom.
They have mass and are essential in determining the atomic number and
identity of an element.
6. What is the component of the nucleus that has mass but no electrical
charge?
Answer: ✔✔ Neutron
Explanation:
Neutrons are neutral particles (no charge) found in the nucleus. They have a
mass similar to protons and help stabilize the nucleus by offsetting the
repulsive forces between the positively charged protons.
7. When an atom has more electrons than protons, it will have:
Answer: ✔✔ A negative charge
Explanation:
An atom with more electrons than protons becomes negatively charged,
forming an anion. This is because electrons carry a negative charge, and
when there are more electrons than protons, the overall charge of the atom
becomes negative.
