Biology Vocabulary Quiz Ch. 6.1 and 6.2

Building block of matter; contains subatomic particles- neutrons, protons, and electrons

• atoms

• nucleus

• molecule

• element

center of an atom; contains neutrons and protons

• electron

• proton

• nucleus

• product

positively charged particle in an atom's nucleus

• nucleus

• proton

• isotope

• electron

particle without a charge in an atom's nucleus

• electron

• nucleus

• atom

• neutron

negatively charged particle that occupies space around an atom's nucleus

• electron

• molecule

• nucleus

• ionic bond

pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means

• molecule

• element

• chemical reaction

• catalyst

pure substance with unique properties; formed when two or more different elements combine

• molecule

• atom

• compound

• enzyme

type of chemical bond formed when atoms share electrons

• ionic bond

• covalent bond

• molecule

• atom

compound whose atoms are held together by covalent bonds

• ionic bond

• molecule

• element

• chemical reaction

electrical attraction between two oppositely charged atoms or groups of atoms

• covalent bond

• ionic bond

• activation energy

• electron