Quiz on Basic Chemistry Concepts

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

• Molecule

• Atom

• Compound

• Mixture

What is an element defined by?

• Number of electrons

• Number of neutrons

• Number of protons

• Number of isotopes

What is the composition of an atom?

• Only protons

• Protons, neutrons, and electrons

• Only electrons

• Only neutrons

How is each element represented on the periodic table?

• By its atomic mass

• By a unique symbol

• By its color

• By its size

Which of the following is an example of an atom?

• Carbon (C)

• Oxygen (O)

• Gold (Au)

• Water (H₂O)

What is an element?

• A single atom of any kind

• A collection of atoms that share the same atomic number

• A molecule made of different atoms

• A compound of various elements

Which of the following is NOT an example of an element?

• Carbon (C)

• Oxygen (O)

• Gold (Au)

• Water (H₂O)

How can atoms exist?

• Only as part of a molecule

• Only independently

• Independently or as part of a molecule

• Only in compounds

What is bonding in chemistry?

• The combination of atoms or elements to form molecules or compounds

• The separation of atoms into individual elements

• The destruction of molecules into atoms

• The transformation of elements into gases

What type of bonding occurs when atoms share electrons?

• Ionic bonding

• Covalent bonding

• Metallic bonding

• Hydrogen bonding