Smarty Pants Quiz
09
00
00
Which element has an atomic number of 2?
Lithium
Hydrogen
Helium
Oxygen
No, sorry... Try again!
Because helium is lighter than air it is commonly used to fill airships, blimps and balloons.
Easy peasy lemon squeezy! Try here!
09
00
00
Which element has an atomic number of 2?
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