Exploring Atoms and Molecules

What is the basic unit of matter?

• Atom

• Compound

• Cell

• Molecule

Define an atom.

• An atom is the smallest unit of matter that retains the properties of an element.

• An atom is a form of energy that cannot be seen.

• An atom is a large particle made of protons and neutrons.

• An atom is a type of molecule.

What are the three main subatomic particles?

• Neutrons, electrons, and muons

• Protons, quarks, and neutrinos

• Protons, electrons, and positrons

• Protons, neutrons, and electrons

What is the charge of a proton?

• -1 elementary charge

• +2 elementary charge

• 0 elementary charge

• +1 elementary charge

How is the atomic number of an element determined?

• The atomic number is determined by the element's position in the periodic table.

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

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

• The atomic number is the sum of neutrons and protons in the nucleus.

What does the atomic mass of an element represent?

• The total number of protons in an atom.

• The sum of protons and neutrons in a single isotope.

• The weighted average mass of an element's isotopes.

• The mass of the most abundant isotope only.

What is the difference between atomic mass and atomic weight?

• Atomic mass is the total number of protons and neutrons in an atom.

• Atomic mass and atomic weight are interchangeable terms for the same concept.

• Atomic mass refers to a specific isotope's mass; atomic weight is the average mass of all isotopes.

• Atomic weight is the mass of a single atom measured in atomic mass units.

What is a molecule?

• A molecule is a group of two or more atoms bonded together.

• A molecule is a large structure made of cells.

• A molecule is a type of chemical reaction.

• A molecule is a single atom.

How are molecules formed?

• Molecules are formed by the fusion of light particles.

• Molecules are created from single atoms splitting apart.

• Molecules are formed through the evaporation of liquids.

• Molecules are formed by the bonding of two or more atoms.

What is the significance of chemical symbols?

• Chemical symbols are a form of artistic expression.

• Chemical symbols are irrelevant to chemical reactions.

• Chemical symbols are significant because they provide a standardized way to represent elements and compounds in chemistry.

• Chemical symbols are only used in biology.