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It's elemental!

DIRECTIONS: First, read "Name That Element!" (p. 18). Then, solve the clues below to complete this crossword puzzle. To spell out the bonus words, unscramble the letters in parentheses.

ACROSS

1. Thew two most abundant elements dissolved in seawater:--and sodium

2. Softest known solid on Earth:--

3. Two or more elements combine to form a --.

4. Mixture of metals:--

5. A row in the periodic table:--

6.--earth metals are highly reactive in nature.

DOWN

7. Opposite of acid:--

8. Atoms that have an electric charge:--

9. Inside your stomach, magnesium bonds with --to form a base.

10. Compound that plants use to turn carbon dioxide and water into energy and oxygen: --

11. The Hawaiian Islands are made of this dark volcanic rock:--

12. Members of the same--on the periodic table are located in the same column.

13. Erupted molten rock:--

Bonus:

a. Magnesium is named after Magnesia, a region in Thessaly,--.

b. Magnesium burns with a brilliant white light. That's why it's used in fireworks and f--.

1. chlorine 2. talc 3. compound 4. alloy 5. period 6. alkaline 7. base 8. ions 9. hydroxide 10. chlorophyll 11. basalt 12. group 13. lava

Bonus: a. Greece b. flashbulbs
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Article Details
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Title Annotation:vocabulary builder
Publication:Science World
Article Type:Brief Article
Date:Jan 16, 2006
Words:200
Previous Article:Invent it!
Next Article:Benjamin Franklin: in search of a better world.
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