Ch 5 Vocab Flashcards

Front

Periodic Table

Back

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

Front

Period

Back

A row in the periodic table.

Front

Group

Back

A column in the periodic table.

Front

Atomic Mass

Back

A value that depends on the distribution of an element’s isotopes in nature and the masses of those isotopes.

Front

Atomic Mass Unit

Back

One twelfth of the mass of a carbon-12 atom.

Front

Metals

Back

Elements that are good conductors of heat and electricity, mostly solids, malleable and ductile.

Front

Nonmetals

Back

Elements that are poor conductors of heat and electricity, mostly gases and brittle solids.

Front

Metalloids

Back

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

Front

Valence Electron

Back

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

Front

Alkali Metals

Back

Elements in Group 1A and are extremely reactive.