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LRA 211 Final Review Questions and
Correct Answers
Who discovered the electron? Ans: JJ Thomson
The earliest atomic theory based on arrangement similar to the
solar system is attributed to? Ans: Rutherford
What are the three fundamental particles of the atom? Ans:
proton, neutron and electron
what does the atomic nucleus contain? Ans: protons and neutrons
What is the component of the nucleus that has a positive charge
and mass? Ans: proton
What is the component of the nucleus that has mass but no
electrical charge is? Ans: neutron
when an atom has more electrons than protons it will have: Ans: a
negative charge
When an atom becomes negatively or positively charged it is
usually due to a change in the number of Ans: electrons
a negative ion is Ans: an atom with more electrons than protons
a positive ion is Ans: an atom with more protons than electrons
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the electron shell closest to the nucleus is Ans: k shell
which electromagnetic radiation has the lowest energy level? Ans:
radio waves
As the wave's frequency increases, the wavelength: Ans: decreases
Frequency is typically measured in: Ans: hertz
the process of removing an electron from an atom is: Ans:
ionization
x-rays are produced Ans: using fast-moving electrons
what helps to keep the x-ray tube cool on the inside of the
protective housing? Ans: cooling fans and an oil bath
In terms of the x-ray tube, envelope is another name for the: Ans:
glass or metal enclosure
the positive end of the x-ray tube is called? Ans: anode
the negative end of the x-ray tube is called? Ans: cathode
the area of the envelope where x-rays should exit the tube is the:
Ans: target window
the anode serves as a Ans: heat conductor
© 2025 All rights reserved
LRA 211 Final Review Questions and
Correct Answers
Who discovered the electron? Ans: JJ Thomson
The earliest atomic theory based on arrangement similar to the
solar system is attributed to? Ans: Rutherford
What are the three fundamental particles of the atom? Ans:
proton, neutron and electron
what does the atomic nucleus contain? Ans: protons and neutrons
What is the component of the nucleus that has a positive charge
and mass? Ans: proton
What is the component of the nucleus that has mass but no
electrical charge is? Ans: neutron
when an atom has more electrons than protons it will have: Ans: a
negative charge
When an atom becomes negatively or positively charged it is
usually due to a change in the number of Ans: electrons
a negative ion is Ans: an atom with more electrons than protons
a positive ion is Ans: an atom with more protons than electrons
© 2025 All rights reserved
, 2 | Page
the electron shell closest to the nucleus is Ans: k shell
which electromagnetic radiation has the lowest energy level? Ans:
radio waves
As the wave's frequency increases, the wavelength: Ans: decreases
Frequency is typically measured in: Ans: hertz
the process of removing an electron from an atom is: Ans:
ionization
x-rays are produced Ans: using fast-moving electrons
what helps to keep the x-ray tube cool on the inside of the
protective housing? Ans: cooling fans and an oil bath
In terms of the x-ray tube, envelope is another name for the: Ans:
glass or metal enclosure
the positive end of the x-ray tube is called? Ans: anode
the negative end of the x-ray tube is called? Ans: cathode
the area of the envelope where x-rays should exit the tube is the:
Ans: target window
the anode serves as a Ans: heat conductor
© 2025 All rights reserved
