The Periodic Table is organized by increasing

• charges

• atomic number

• mass number

• electronegativity

The elements in the middle of the table are called the _____________ metals because their properties change from metallic to nonmetallic.

• positive

• negative

• magnetic

• transition

The _________________ are a small group of elements that have both metallic and nonmetallic properties.

• Oxygen Group

• Nitrogen Group

• Metalloids

• Halogens

The vertical columns on the periodic are called _______________.

• Rows

• Periods

• Groups

• Valence

The horizontal rows of the Periodic Table are called ______________.

• Periods

• Groups

• Families

• Halogens

The _______________electrons are the electrons on the outer most energy level of the atom.

• valence

• core

• excited

• ground state

Elements of the same ______________ have the same number of valence electrons, which determines the elements chemical properties.

• Period

• Row

• Group

This element does not match the properties of any other group so it stands alone. It is placed above Group 1 but it is not part of that group. It is very reactive, colorless, odorless, and a gas at room temperature.

• Hydrogen

• Helium

• Nitrogen

• Oxygen

Group 1: These metals are extremely reactive. They all have one valence electron. They are shiny and silver in color. They are soft and can be cut with a knife.

• Transition Metals

• Alkali Metals

• Alkaline Metals

• Lanthanides

Group 2: Slightly less reactive because they have 2 valence electrons. They are silver colored and more dense that Group 1 metals.

• Transition Metals

• Alkali Metals

• Alkaline-earth Metals

• Actinides