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Beryllium 4 Be

Magnesium 12 Mg

Figure 6 Group 2 elements are found in many things. Beryllium is found in the gems emerald and aquamarine. Magnesium is found in the chlorophyll of green plants.

Group 2 Alkaline Earth Metals

Calcium 20 Ca

Strontium 38 Sr

Barium 39 Ba

Radium 88 Ra

Alkaline Earth Metals Next door to the alkali metals’ fam- ily are their Group 2 neighbors, the alkaline earth metals. Each alkaline earth metal is denser and harder and has a higher melt- ing point than the alkali metal in the same period. Alkaline earth metals are reactive, but not as reactive as the alkali metals. Some uses of the alkaline earth elements are shown in Figure 6.

What are the names of the elements that are alkaline earth metals?

Group 13 The Boron Family

Boron 5 B

Aluminum 13 Al

Groups 13 through 18

Notice on the periodic table that the elements in Groups 13–18 are not all solid metals like the elements of Groups 1 and 2. In fact, a single group can contain metals, nonmetals, and metal- loids and have members that are solids, liquids, and gases.

Gallium 31 Ga

Indium 49 In

Thallium 81 Tl

Group 13—The Boron Family The ele- ments in Group 13 are all metals except boron, which is a brittle, black metalloid. This family of elements is used to make a variety of prod- ucts. Cookware made with boron can be moved directly from the refrigerator into the oven without cracking. Aluminum is used to make soft-drink cans, cookware, siding for homes, and baseball bats. Gallium is a solid metal, but its melting point is so low that it will melt in your hand. It is used to make computer chips.


  • K CHAPTER 4 Periodic Table

(l)Joail Hans Stern/Liaison Agency/Getty Images, (r)Leonard Freed/Magnum/PictureQuest

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