Atoms and Molecules

What is the charge of electrons?

• Electrons are positively charged.

• Electrons have no charge.

• Electrons are negatively charged.

• Electrons are neutrally charged.

What are the three particles that make up an atom?

• Protons, neutrons, and electrons.

• Protons, electrons, and positrons.

• Neutrons, electrons, and neutrinos.

• Protons, muons, and electrons.

What is the atomic number?

• The number of neutrons in an atom

• The number of protons in the nucleus of an atom

• The total number of electrons in an atom

• The mass of an atom in atomic mass units

What is the difference between an atom and a molecule?

• An atom is a single unit of an element, while a molecule is a group of two or more atoms bonded together.

• An atom is a group of two or more molecules, while a molecule is a single unit of an element.

• An atom can exist independently, while a molecule cannot exist without an atom.

• An atom is larger than a molecule, which is made up of smaller particles.

What are elements made of?

• One type of atom

• Multiple types of atoms

• Molecules

• Compounds

What is an atom?

• A molecule made of two or more atoms.

• The smallest unit of matter that retains the properties of an element.

• A type of subatomic particle found in the nucleus.

• A large structure made of cells.

What is the periodic table?

• A chart that organizes all known elements by their atomic number.

• A list of all known chemical compounds.

• A graphical representation of chemical reactions.

• A table that shows the properties of metals only.

What is the role of protons in an atom?

• Protons determine the identity of an element and its atomic number.

• Protons are responsible for the chemical bonding of atoms.

• Protons are negatively charged particles in the nucleus.

• Protons are the primary source of an atom's mass.

What is the mass number of an atom?

• The total number of electrons in an atom.

• The total number of protons and neutrons in the nucleus of an atom.

• The total number of protons in an atom.

• The total number of neutrons in an atom.

Which part of an atom is positively charged?

• Neutrons

• Electrons

• Protons

• Nuclei