U1V2 The Periodic Table

Definition: the number of PROTONS plus NEUTRONS in the nucleus of an atom.

• Atomic Number

• Chemical Symbol

• Atomic Mass

• Periodic Table

Definition: a small number written to the right and slightly below the chemical symbol to tell the number of atoms of that element in the substance.

• Chemical Symbol

• Chemical Formula

• Coefficient

• Subscript

Definition: vertical (up/down) column in the periodic table, also called the chemical family.

• Atomic Mass

• Metalloids

• Periods

• Group

Definition: subatomic particles IN the nucleus of an atom that have no charge. (neutral)

• Neutrons

• Atoms

• Protons

• Electrons

Definition: a chart that organizes information about all of the known elements according to their properties.

• Periodic Table

• Atomic Number

• Chemical Formula

• Chemical Symbol

Subatomic particles located IN the nucleus of an atom that carry a positive charge (+).

Subatomic particles IN the nucleus of an atom that have no charge. (neutral)

Horizontal (side/side) row in the periodic table.

Elements that have some properties of both metals and nonmetals.

A one- or two-letter code that represents an element.

• Chemical Formula

• Chemical Symbol

• Periodic Table

• Atomic Number