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Periodic Table Crossword Puzzle

Across
I am the key ingredient for most life on Earth. My atomic number is 6.
I am a colorless, odorless, noble gas. My atomic number is 2.
I am a rare metal used to make bronze. My atomic number is 50 and my symbol is Sn.
I make up 2% of the Earth's crust mixed in with other elements. My atomic number is 12.
I am a part of all proteins & I can be found in all living systems. I am found in fertilizer. My symbol is N.
I am found in stalactites & stalagmites in caves. I help build healthy bones & muscles. My symbol is Ca.
Down
I am used in soda cans, aircraft & automobiles. My symbol is Al.
I keep life on earth humming. Without me you couldn't breathe.
I am an inert, noble gas that makes signs glow. My symbol is Ne.
I am odorless and tasteless & I am known as the "king of poisons". My symbol is As.