Physical Science Chapter 5 (Pearson)

An arrangement of elements in columns, based on a set of properties that repeat from row to row.

• periodic table

• periodic law

• groups

• metalloids

The horizontal rows in the periodic table.

• period

• group

• periodic law

• periodic table

The vertical columns on the periodic table

• period

• group

• periodic table

• periodic law

Properties of elements repeat in a predictable way when atomic numbers are used to arrange elements into groups.

• periodic table

• period

• periodic law

• group

Defined as one-twelfth of the mass of a carbon-12 atom.

• atomic mass unit

• periodic law

• metals

• groups

Elements that are good conductors of heat and electricity.

• nonmetals

• metalloids

• groups

• metals

Elements that are poor conductors of heat and electricity.

• metals

• metalloids

• nonmetals

• periods

Elements with properties that fall between those of metals and nonmetals.

• metalloids

• nonmetals

• metals

• halogens

An electron that is in the highest occupied energy level of an atom.

• alkali metals

• valence electron

• period

• metalloid

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The elements in group 1A that have a single valence electron and are extremely reactive.

• alkali metals

• alkaline earth metals

• halogens

• noble gases