Chemistry Test Review

Which of the following best describes a neutron?

• It has no charge and about the same mass as a proton

• It has a negative charge and much less mass than a proton

• It has a positive charge and much more mass than a neutron

• It has a negative charge and about the same mass as a neutron

What type of particles are found in the cloud surrounding an atom's nucleus?

• positively charged particles and negatively charged particles
• negatively charged particles only
• neutral particles and positively charged particles
• positively charged particles only

What is the mass number of a sodium atom that has 12 neutrons?

• 11
• 12
• 22
• 23

An atom has 79 protons, 118 neutrons, and 79 electrons. What is the charge of the atom's nucleus?

• +79
• +118
• 0
• -5

An atom has 38 protons, 50 neutrons, and 36 electrons. What is the atom's charge?

• +2
• -2
• 0
• +12

An atom of a certain element has 50 protons, 50 electrons, and a mass number of 119. At room temperature, this element is a solid. How many neutrons are in this atom?

• 50
• 100
• 119
• 69

An atom's electrical charge is neutral because...

• the atom has more neutrons than protons or electrons
• the negative charge of the neutrons cancel out the positive charge of the protons
• the electron's mass is much smaller than the mass of the protons or neutrons
• the atom has the same number of protons and electrons

Which of these best describes one of the subatomic particles that could be found at location X?

• it has no mass and a positive charge
• it has a large mass and a negative charge
• it has a large mass and a positive charge
• it has no mass and a neutral charge

Identify the atom.

• Carbon
• Nitrogen
• Silicon
• Phosphorus

Identify the atom based on the number of neutrons.

• Beryllium
• Boron
• Lithium
• Carbon