The Uncertain Location of Electrons

What are all physical things made up of?

• Molecules

• Cells

• Atoms

• Quarks

Which subatomic particles are found in the core of an atom?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Only protons

What determines the identity of an atom?

• The number of electrons in its outer shell

• The number of neutrons in its nucleus

• The number of protons in its nucleus

• Its atomic mass

What term do chemists use to describe the shapes that represent the probability of finding an electron around the nucleus?

• Electron shells

• Electron clouds

• Orbitals

• Energy levels