Basic Concepts of Atoms

What is the basic building block of all matter in the universe?

• A proton

• A compound

• An atom

• A molecule

Which particles are found in the nucleus of an atom?

• Only protons

• Neutrons and electrons

• Protons and neutrons

• Electrons and protons

Which particles are negatively charged and move around the nucleus of an atom?

• Electrons

• Nuclei

• Neutrons

• Protons

What is the primary function of neutrons in the nucleus of an atom?

Which of the following best describes the nucleus of an atom?

• It contains protons and neutrons and is very small compared to the atom.

• It is made up of only neutrons.

• It is the outer part of the atom where electrons are found.

• It contains most of the atom's mass and is very large.

What determines the identity of an element?

• The number of neutrons in the nucleus.

• The number of protons in the nucleus.

• The number of electrons surrounding the nucleus.

• The total mass of the atom.

Which of the following statements about elements is true?

• Elements are pure substances that cannot be broken down into simpler substances.

• Elements can be broken down into simpler substances by chemical means.

• Elements are made up of only one type of molecule.

• Elements contain both atoms and molecules.

What is the significance of the nucleus in an atom?

Which of the following statements about molecules and compounds is true?

• A molecule can consist of only one type of atom

• Molecules and compounds are the same

• A compound is always larger than a molecule

• A molecule can consist of different types of atoms, while a compound must consist of different types of atoms

What is the difference between a molecule and a compound?