Atom and Periodic Table

Front

A positively charged particle in the nucleus of an atom

Back

Proton

Front

A neutrally charged particle in the nucleus of an atom

Back

Neutron

Front

No charge

Back

Neutron

Front

A negatively charged particle outside the nucleus of an atom

Back

Electron

Front

Electron in the outermost or highest energy level, determines an atom's reactivity.

Back

Valence electron

Front

One of the seven horizontal rows of the periodic table; elements have the same number of electron levels.

Back

Period

Front

One of the vertical columns or families on the periodic table, having the same number of valence electrons.

Back

Group

Front

An element on the left side of the periodic table, with a shiny appearance (high luster), that conducts heat and electricity well, has a high melting point, is malleable and ductile, and tends to lose electrons when bonding.

Back

Metal

Front

An element next to the zigzag line on the periodic table, having characteristics of both metals and nonmetals; a semiconductor.

Back

Metalloid

Front

An element on the right side of the periodic table that is dull, not shiny, brittle, not bendable, a poor conductor of heat and electricity, has a low melting point, and tends to gain or share electrons when bonding.

Back

Nonmetal