Atoms and Molecules

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

• molecule

• compound

• ion

• atom

What are the three subatomic particles that make up an atom?

• protons, neutrons, and electrons

• protons, electrons, and quarks

• electrons, photons, and neutrinos

• protons, neutrons, and positrons

What is the charge of a proton?

• 0

• +2

• +1

• -1

What is the charge of an electron?

• -1.6 x 10^-19 coulombs

• 0 coulombs

• 1.6 x 10^-19 coulombs

• -1.6 x 10^-9 coulombs

What is the charge of a neutron?

• 0

• 1

• 2

• -1

What is the atomic number of an element?

• The atomic number of an element is the number of protons in the nucleus of an atom.

• The atomic number of an element is the number of protons and neutrons in the nucleus of an atom.

• The atomic number of an element is the number of neutrons in the nucleus of an atom.

• The atomic number of an element is the number of electrons in the nucleus of an atom.

What is the mass number of an element?

• The atomic number of an element.

• The number of protons in an element.

• The number of neutrons in an element.

• Correct answer for the question

What is an isotope?

• A variant of an element with the same number of protons but a different number of neutrons.

• A variant of an element with the same number of neutrons but a different number of protons.

• A variant of an element with the same number of electrons but a different number of protons.

• A variant of an element with the same number of protons but a different number of electrons.

What is a molecule?

• A molecule is a form of energy.

• A molecule is a type of cell.

• A molecule is a group of atoms bonded together.

• A molecule is a unit of time.

What is the difference between an ionic bond and a covalent bond?

• Ionic bond involves the sharing of electrons, while covalent bond involves the transfer of electrons.

• Ionic bond involves the attraction between two atoms, while covalent bond involves the repulsion between two atoms.

• Ionic bond involves the formation of a temporary bond, while covalent bond involves the formation of a permanent bond.

• Ionic bond involves the transfer of electrons, while covalent bond involves the sharing of electrons.