Understanding Atomic Structure

What is the basic unit of matter?

• Molecule

• Atom

• Cell

• Compound

Define an atom.

• An atom is a type of chemical bond between elements.

• An atom is the largest unit of matter in the universe.

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

What are molecules made of?

• Molecules are made of elements.

• Molecules are made of atoms.

• Molecules are made of compounds.

• Molecules are made of cells.

How do atoms combine to form molecules?

• Atoms combine by exchanging electrons without forming bonds.

• Atoms combine by undergoing nuclear fusion.

• Atoms can only combine in solid states.

• Atoms combine to form molecules by forming chemical bonds, either covalent or ionic.

What is the charge of a proton?

• +1 elementary charge

• 0 elementary charge

• -1 elementary charge

• +2 elementary charge

Where are electrons located in an atom?

• Electrons orbit the nucleus in fixed paths like planets.

• Electrons are found in the nucleus of an atom.

• Electrons are located in electron shells around the nucleus of an atom.

• Electrons are located in the protons of an atom.

What is the difference between an atom and a molecule?

• Atoms can exist independently, but molecules cannot.

• 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 molecules, while a molecule is a single element.

• Molecules are always larger than atoms and contain only one type of atom.

What is the atomic number of an element?

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

• The atomic number represents the mass of an element.

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

• The atomic number is the number of neutrons in the nucleus.

How do isotopes of an element differ?

• Isotopes differ in the number of neutrons and atomic mass.

• Isotopes differ in the number of protons and electrons.

• Isotopes have the same atomic mass but different chemical properties.

• Isotopes are different elements with unique atomic numbers.

What role do valence electrons play in chemical bonding?

• Valence electrons are responsible for forming chemical bonds by being shared or transferred between atoms.

• Valence electrons are only involved in ionic bonding.

• Valence electrons do not influence the stability of atoms.

• Valence electrons are irrelevant in the formation of molecules.