Understanding Atoms and Molecules

What is the smallest unit of matter that retains the properties of an element?

• Atom

• Molecule

• Electron

• Proton

Which subatomic particle is negatively charged and orbits the nucleus?

• Photon

• Electron

• Neutron

• Proton

What is the role of neutrons in an atom?

• They attract electrons

• They add to the atom's charge

• They orbit the nucleus

• They add to the atom's weight

How many electrons can the L shell hold?

• 2

• 8

• 32

• 18

What is the outermost shell of an atom called?

• Electron cloud

• Core shell

• Valence shell

• Nucleus

What is a molecule?

• A single atom

• An electron orbit

• A type of subatomic particle

• A group of atoms bonded together

What is the atomicity of a water molecule (H2O)?

• Triatomic

• Diatomic

• Polyatomic

• Monatomic

What happens when an atom loses an electron?

• It becomes neutral

• It forms a molecule

• It becomes a negative ion

• It becomes a positive ion

What is the valency of an atom?

• The number of electron shells

• The number of protons in the nucleus

• The number of electrons it can lose, gain, or share

• The number of neutrons in the nucleus

How are elements organized in the periodic table?

• By size

• By atomic weight

• By atomic number and properties

• By color