http://www.ck12.org Chapter 2. Matter
Summary
- Groups 13–16 of the periodic table contain one or more metalloids, in addition to metals, nonmetals, or both.
- Group 13 is called the boron group, and boron is the only metalloid in this group. The other group 13 elements
are metals. - Group 14 is called the carbon group. This group contains two metalloids: silicon and germanium. Carbon is
a nonmetal, and the remaining elements in this group are metals. - Group 15 is called the nitrogen group. The metalloids in this group are arsenic and antimony. Group 15 also
contains two nonmetals and one metal. - Group 16 is called the oxygen group. Tellurium is the only metalloid in this group, which also contains three
nonmetals and one metal.
Vocabulary
- metalloid: Class of elements that have some properties of metals and some properties of nonmetals.
Explore More
Watch the video at the following URL, and then answer the questions below.
http://www.youtube.com/watch?v=NO36yksPOBM (6:50)
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/54889- Why does boron act chemically like a metal?
- Why do arsenic, antimony, and tellurium tend to have chemical properties similar to nonmetals?
- Sometimes silicon and germanium behave like metals, and sometimes they behave like nonmetals. Explain
why.
Review
- Which elements in groups 13–16 are metalloids?
- Name two physical properties that boron shares with most metals.
- What property of the metalloid silicon makes it useful for computer chips?
- A recent investigation found relatively high levels of the metalloid arsenic in samples of apple juice. Why
might this be a serious problem? - Why is the metalloid tellurium used to make solar panels?