## Metals and Nonmetals

In addition, there are some other designations on the periodic table that you need to know. Most of the elements on the periodic table shown below are green in color. Those elements are metals. The elements that are shown in red are the nonmetals. The orange (or brown) ones (He, Ne, etc.) are the inert gases. (They are also nonmetals.)  Notice that the dividing line between the metals and nonmetals starts at aluminum, a metal, and goes down diagonally to the right. So it is really easy to figure out where the dividing line is between the metals and the nonmetals. Note that hydrogen is classified as a nonmetal, even though this periodic table shows it way over on the left side with the alkali metals.

 Periodic Table Showing Metals, Nonmetals and Inert Gases H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac § * Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu § Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Let me make a few comments about the periodic table shown in example 1 in your workbook. It is the standard periodic table for this course. It has the symbol, the atomic number (in the upper left) and the atomic weight (below the symbol) for each element. In this course, you can expect to have a periodic table like this available to you anytime you take a test, a quiz, do your homework, or whatever. It is a source of atomic numbers, symbols, and atomic weights. Notice that it does not have the names on it. You need to be familiar with the relationship between names and symbols, which is why you had to memorize the names and symbols of the more common elements earlier in the course. This is the periodic table that you will become very familiar with as the course proceeds.

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