Unit 2 Test Review Honors

Which particle represents the smallest unit of matter?

• electron

• neutron

• proton

• atom

Which subatomic particle has a positive charge?

• Neutron

• Electron

• Photon

• Proton

Which subatomic particle has no charge?

• photon

• neutron

• proton

• electron

Which subatomic particle has a negative charge?

• neutron

• proton

• electron

• positron

Which of the following is true about isotopes of an element?

• They have the same number of protons but different number of neutrons.

• They have the same number of protons and neutrons.

• They have different number of protons and neutrons.

• They have the same number of neutrons but different number of protons.

How do you calculate the atomic mass of an element?

• By taking the average of the masses of all the isotopes of that element.

• By dividing the mass of the element by its atomic number.

• By taking the weighted average of the masses of all the isotopes of that element, based on their natural abundance.

• By adding the masses of all the isotopes of that element together.

What is the process by which an unstable atomic nucleus loses energy by emitting radiation?

• nuclear fusion

• radioactive decay

• chemical reaction

• thermal expansion

What is half-life?

• The time taken for all of the radioactive nuclei in a sample to decay.

• The time taken for half of the non-radioactive nuclei in a sample to decay.

• The time taken for half of the atoms in a sample to decay, regardless of whether they are radioactive or not.

• The time taken for half of the radioactive nuclei in a sample to decay.

Which of the following is not a type of radioactive decay?

• Alpha decay

• Beta decay

• Gamma decay

• Delta decay

Which of the following is true about radioactive isotopes?

• They have a longer half-life compared to non-radioactive isotopes.

• They have an unstable nucleus and emit radiation.

• They have a neutral charge and do not interact with other atoms.

• They have a stable nucleus and do not emit radiation.