Unit 1 Atomic Structure and Properties MC

Which subatomic particle has a positive (+) charge?

• Neutron
• Proton
• Electron

True or False - Protons and Neutrons have about the same mass.

• True - They have about the same mass
• False - They do not have about the same mass

Which subatomic particle has a neutral or no charge?

• Proton
• Electron
• Neutron

Which subatomic particle has a negative (-) charge?

• Proton
• Electron
• Neutron

Which two subatomic particles make up the nucleus of an atom?

• Protons and Electrons
• Neutrons and Electrons
• Electrons and Protons
• Protons and Neutrons

At what part of the atom is the arrow pointing?

• nucleus

• energy level

• electron

• proton

The mass of an atom is

• equal to the number of protons

• the protons + electrons

• the protons + neutrons

• the protons + neutrons + electrons

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

How is the number of neutrons in the nucleus of an atom calculated?

• Add the number of e- and p+ together
• Subtract the number of e- from p+
• Subtract the number of p+ from the mass number
• Add the mass number to the number of e-

Which of the following compounds contains the most oxygen by mass percentage?

• H₂O

• H₂O₂

• H₃O⁺

• none because they have equal percentage composition