Atomic mass

The video tutorial explains the concept of isotopes and their significance in chemistry. It covers the definition of atomic mass, expressed in atomic mass units, and its relation to the mass of a proton. The tutorial further details the components of atomic mass, including protons, neutrons, and electrons, and discusses how the number of neutrons can vary between isotopes, affecting their atomic mass.

What is an isotope in relation to an element?

• A molecule with a different number of atoms

• A variation of an element with a different number of neutrons

• An element with a different number of electrons

• A different element with the same number of protons

What is the atomic mass unit roughly equivalent to?

• The mass of an atom

• The mass of a proton

• The mass of a neutron

• The mass of an electron

Which particles contribute to the atomic mass of an atom?

• Only protons

• Protons, neutrons, and electrons

• Only electrons

• Only protons and neutrons

Why does atomic mass vary between isotopes?

• Because the number of electrons changes

• Because the number of protons changes

• Because the number of atoms changes

• Because the number of neutrons changes

What does the atomic mass represent?

• The total number of electrons in an atom

• The total number of protons in an atom

• The total rest mass of protons, neutrons, and electrons

• The total number of neutrons in an atom