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Activity Title: Page 8
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<strong>The Periodic Table:An Overview of the Elements </strong>
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What elements are most abundant...
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...on Earth?
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<font size="5">The composition of the earth's crust is very different
from that of the universe as a whole. </font>
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What are the three most abundant elements in the earth's crust? List
from most to least abundant.
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How does the abundance of H in the earth's crust compare to the
abundance in the universe?
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...in the human body?
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<font size="5">Some 60 chemical elements are found in the body,
but what all of them are doing there is still unknown. Roughly 96
percent of the mass of the human body is made up of just four
elements: oxygen, carbon, hydrogen and nitrogen; the majority of
the hydrogen and oxygen are in the form of water. The remaining 4
percent is a sparse sampling of the periodic table of elements.
These elements perform various functions, including the building
of bones and cell structures, regulating the body's pH, carrying
charge, and driving chemical reactions.<br><br>The Food and Drug
Administration, or FDA, has set a reference daily intake for 12
minerals, and there are several other elements that may play a
biological role but are not classified as essential. Identifying
the exact benefit of an element can be difficult as they rarely
enter the body in a pure form. "We don't look at them as single
elements but as elements wrapped up in a compound," said Christine
Gerbstadt, national spokesperson for the American Dietetic
Association. </font><font size="2">http://www.livescience.com/health/090416-cl-human-body.html</font>
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Approximately how many elements are found in the human body?
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What four elements contribute to close to 96% of the mass of the human
body?
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What functions do these elements perform?
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What makes it difficult for the FDA to determine why an element is
essential?
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