Atoms and Periodic Table

What is the special unit used to measure the mass of subatomic particles?

• Pound

• Gram

• Atomic Mass Unit

• Kilogram

How many atomic mass units does a single proton have?

• 0.5 AMU

• 1 AMU

• 2 AMU

• 3 AMU

How do you calculate the mass number of an atom?

• By adding the number of electrons and protons

• By adding the number of protons and neutrons

• By adding the number of neutrons and electrons

• By adding the number of protons, neutrons, and electrons

What is an isotope?

• An atom with a different number of atomic mass units

• An atom with a different number of electrons

• An atom with a different number of neutrons

• An atom with a different number of protons

Why is the atomic mass of an element usually not a whole number?

• Because it only considers the mass of protons

• Because it includes the mass of electrons

• Because it is a weighted average of isotopes

• Because it is rounded to the nearest whole number