Periodic Table Elements and Ions

Nonreactive nonmetals in Group 18 of the periodic table

• Halogens

• Noble Gases

• Alkaline-Earth Metals

• Alkali Metals

Elements in Group 17 of the periodic table

• Halogens

• Noble Gases

• Alkaline-Earth Metals

• Alkali Metals

Electron that is found in the outermost shell of an atom; determines the atom's chemical properties

• ductle

• valence electron

• chemical bond

• electron cloud

The atomic number tells

• the number of protons and electrons

• the number of protons and neutrons

• the number of neutrons

• the number of valence electrons

The atomic mass tells

• the sum of protons + electrons

• the sum of neutrons + electrons

• the difference of atomic mass - atomic number

• the sum of protons + neutrons

The number of Groups in the periodic table

• 7

• 18

• 12

• 9

Elements in the same group have

• similar chemical and physical properties

• the same number of energy levels

Elements in the same period have

• similar chemical and physical properties

• the same number of energy levels

A chemical symbol ALWAYS starts with

• a lower case letter

• a capital letter

• a whole number

• a decimal

The horizontal row on the periodic table is called a

• group

• family

• period

• atomic number