2007-05-27 12:59:02 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
try the noble gass as they are unreactive.
2007-05-27 13:18:18 · answer #1 · answered by Dr. Eddie 6 · 1⤊ 0⤋
H2
N2
O2
hydrogen, nitrogen and oxygen
The definition of a pure substance is a substance composed of only one type of atom (element) or molecule
nitrogen makes up about 75% of the air that you breathe. oxygen gas is also in there, along with some (very very little argon - as a comment to the second post). Sure hydrogen gas is out there: On the Earth, hydrogen is not very common, existing only in the thin sheet of water covering 70% of the Earth, as only 0.127% by weight of the lithosphere, it is also present in about 5 x 10-5% by volume of air. - in response to the third post.
I think the point is - there are lots of elements that do exist naturally as pure substances.
I am also going to add carbon to the list - afterall - we mine those diamonds!!
2007-05-27 13:03:30 · answer #2 · answered by Anonymous · 1⤊ 1⤋
Carbon (coal)
Gold, in tiny amounts
Do oxygen and nitrogen count? They are not chemically combined, just mixed together in the atmosphere.
Responding to a previous answer, you wouldn't find pure hydrogen existing in nature. It's mostly combined with oxygen (that stuff called "water" y'know?)
2007-05-27 13:05:34 · answer #3 · answered by eagedeon 3 · 0⤊ 1⤋
I would choose the noble gases He, Ne, and Ar as they do not react and are found in air.
Other possibilities would be the valuable metals, Au, Ag and Pt. They do not react much either
2007-05-27 13:04:00 · answer #4 · answered by reb1240 7 · 1⤊ 0⤋