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It's elemental!

Name: --

DIRECTIONS: First, read "Name That Element!" (p. 22). Then, solve the clues below to complete this crossword puzzle. To spell out the bonus words, unscramble the letters in parentheses.

[ILLUSTRATION OMITTED]

ACROSS

1. A highly -- chemical combines easily with other elements.

2. In its pure state, flourine is a greenish -- gas.

3. The atomic number equals the number of --in an atom's nucleus.

4. Flourine combines with all other elements except helium, neon, and --.

5. The atomic mass equals the number of protons plus the number of -- found in a single atom of an element.

DOWN

6. A once-popular, but ozone-damaging, refrigerant contained flourine and the element --.

7. Earth's ozone layer is a protective layer of gas located in the upper --.

8. When -- break down food, they release acids.

9. A -- is made of two or more elements that are chemically combined.

10. A -- is a row on the periodic table.

Bonus: Flourine, the thirteenth most abundant element, is released into the environment naturally via (a.) -- and (b.) --.

ANSWER:

1. reactive 2. yellow 3. protons 4. argon 5. neutrons 6. chlorine 7. atmosphere 8. microbes 9. compound 10. period Bonus: a. air b. water
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Article Details
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Title Annotation:VOCABULARY BUILDER
Publication:Science World
Date:Feb 19, 2007
Words:195
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Next Article:Tobacco addiction and secondhand smoke.


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