Chemistry Benchmark Vocabulary

Precipitate

• a solid formed when two liquids are mixed and chemically react

• a liquid formed when two solids are mixed and chemically react

• a reactant in an endothermic reaction

Tags

NGSS.MS-PS1-2

Atomic Mass

• protons + neutrons + electrons

• neutrons + electrons

• protons + neutrons

Reactant

• A substance on the right-hand side of an arrow in a chemical equation that is produced

• A substance on the left-hand side of an arrow in a chemical equation that undergoes a chemical change

• Any substance undergoing a physical change

Protons

• Negative particles in an atom

• Positive particles in an atom

• Neutral particles in an atom

Tags

NGSS.MS-PS1-1

Electrons

• Negative particles in an atom

• Positive particles in an atom

• Neutral particles in an atom

Tags

NGSS.MS-PS1-1

Neutrons

• Negative particles in an atom

• Positive particles in an atom

• Neutral particles in an atom

Valence electrons

• electrons in the inner-most ring of an atom; determine the atomic mass number

• all the electrons inside an atom

• electrons in the outer-most ring of an atom; determine the reactivity

Group

• a horizontal left-to-right period on the periodic table - elements in a group share many properties

• the 3 types of elements found on the periodic table

• a vertical up and down column on the periodic table - elements in a group share many properties

Halogens

• Group 16, have 6 valence electrons

• Group 17, have 7 valence electrons

• Period 3, have 7 valence electrons

Alkali Metals

• Group 1, have 1 valence electron

• Period 1, have 1 valence electron

• Group 18, have 8 valence electrons