Element Crossword Puzzles - The Noble Gases

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The Noble Gases

Across

	1.		This element's name comes for the Greek word for hidden.

	4.		This element makes up nearly 1% of the earth's atmosphere.

	6.		Ions of this element were used as a propellant aboard the space probe Deep Space 1.

Down

	2.		This element is the fourth most abundant element in the universe.

	3.		This radioactive gas sometimes seeps into and accumulates in houses.

	5.		The first member of the Noble Gases, this element is the second most abundant element in the universe.

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