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

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

The vertical columns on the periodic are called _______________.

The horizontal rows of the Periodic Table are called ______________.

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

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

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.

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.

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

Groups 3-12: These metals have a moderate range of reactivity and a wide range of properties. They are shiny and good conductors of heat and electricity. They have higher densities and melting points than Groups 1 and 2. These have 1 or 2 valence electrons.

Elements with atomic numbers 57-70 and 89-102: These metals were taken out and placed at the bottom of the table so the table wouldn't be so wide. Some are shiny and reactive. Others are radioactive and unstable. Elements 95-103 do not exist in nature but have been manufactured in the lab.

Group 13: Contains on metalloid and 4 metals. They are reactive. All have 3 valence electrons (Group # minus 10).

Group 14: Contains one nonmetal, two metalloids, and two metals. These all have 4 valence electrons (Group # minus 10) and have varied reactivity.

Group 15: Contains two nonmetals, two metalloids, and one metal. They have varied reactivity. These elements have 5 valence electrons (Group # minus 10).

Group 16: Contains three nonmetals, one metalloid, and one metal. They are a reactive group. These elements all have 6 valence electrons (Group # minus 10).

Group 17: All nonmetals. Very reactive. Poor conductors of heat and electricity. Tend to form salts with metals. Example NaCl: sodium chloride which is known as table salt. These elemtns have 7 valence electrons (Group # minus 10).

Group 18: Unreactive nonmetals. All are colorless, odorless gases at room temperature. These elements have a full outer energy level, usually 8 valence electrons, except for Helium which only has 2 valence electrons.

The elements on the right side of the Periodic Table are classified as ________________.

The elements on the left side of the periodic table are classified as ________________.

How do you find the square of a number?