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Periodic Table Challenge

Lorenzo Bacani

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    20              
21                        
     

Across
3.Our our atmosphere is almost 1% made up of this element.
4.What is the most abundant atom in the universe?
7.Used to blow up baloons.
9.Makes up 80% of the air you breathe.
10.Elements that are unreactive.
13.Used as a disinfectant
17.Copper and Tin are combined to make this substance.
18.He discoverd a pattern of the elements in 1869.
20.Can be found in nature as a yellow solid.
21.Is on a match box.
Down
1.Elements that combine with most metals to produce salts.
2.Has a density higher than alkali metals.
5.Used to make sodium chloride (table salt).
6.Used to treat water.
8.In bananas
11.The number of protons equals this.
12.The most reactive metals in the periodic table.
14.An important part of a compound that keeps your bones and teeth healthy.
15.Makes up 20% of the air we breathe.
16.The most abundant metal in Earth's crust.
19.Element of Group 18: Noble Gases.

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