HTHS 1110 Unit 2 Questions and All
Correct Answers 2025-2026 Updated.
What are the elementary particles that make up atoms? - Answer Neutrons, protons,
electrons
Describe the charge, mass and relative location of neutrons, protons, and electrons. - Answer
Neutrons: Have no charge. Mass of 1.009 Da. Rounded to 1 Da. They are located in the Nucleus.
Protons: Found in the Nucleus. Mass of 1.007 Da. Carry positive charge.
Electrons: They have a negative charge. Distant from Nucleus. Mass of 0.0005 Da.
What are isotopes? - Answer Atoms which vary in the number of neutrons
What does Da or amu stand for? - Answer Daltons or Atomic Mass
What is an Ion? - Answer When the number of electrons is no longer equal to the number of
protons.
What are orbitals? - Answer Circular or pear-shaped probability clouds. They represent
electrons.
State the correct order of energy (wavelength) in the electromagnetic spectrum from lowest to
highest. - Answer Ultraviolet
X-Rays
Gamma Rays
Visible Light
Describe how the wavelength and energy of photons are related. - Answer The wavelength is
what makes a difference between different forms of electromagnetic radiation. The wavelength
is also related to the energy carried by the wave-particle.
Define Isotope - Answer When the number of neutrons vary. Defined first by their element.
Describe how different isotopes of the same element are formed. - Answer As an example,
hydrogen always consists of one proton and one electron. If we add a neutron, so that it
Correct Answers 2025-2026 Updated.
What are the elementary particles that make up atoms? - Answer Neutrons, protons,
electrons
Describe the charge, mass and relative location of neutrons, protons, and electrons. - Answer
Neutrons: Have no charge. Mass of 1.009 Da. Rounded to 1 Da. They are located in the Nucleus.
Protons: Found in the Nucleus. Mass of 1.007 Da. Carry positive charge.
Electrons: They have a negative charge. Distant from Nucleus. Mass of 0.0005 Da.
What are isotopes? - Answer Atoms which vary in the number of neutrons
What does Da or amu stand for? - Answer Daltons or Atomic Mass
What is an Ion? - Answer When the number of electrons is no longer equal to the number of
protons.
What are orbitals? - Answer Circular or pear-shaped probability clouds. They represent
electrons.
State the correct order of energy (wavelength) in the electromagnetic spectrum from lowest to
highest. - Answer Ultraviolet
X-Rays
Gamma Rays
Visible Light
Describe how the wavelength and energy of photons are related. - Answer The wavelength is
what makes a difference between different forms of electromagnetic radiation. The wavelength
is also related to the energy carried by the wave-particle.
Define Isotope - Answer When the number of neutrons vary. Defined first by their element.
Describe how different isotopes of the same element are formed. - Answer As an example,
hydrogen always consists of one proton and one electron. If we add a neutron, so that it
