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I believe it to be Argon
The noble gases are all unreactive because their outer shells are all full. These include argon, krypton, radon, neon, helium and xenon.
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∙ 14y ago
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What are at least this many minerals known to man?
2000
A is a pure substance that contains two or more electrons?
An element is a pure substance that contains two or more electrons. There are many different elements known to man.
Which element in the periodic table can be the lowest temperature reached on Earth?
Liquid hydrogen is the coldest substance known to man, minus 400 degrees
How does diamond react to other elements?
It doesnt react easily other elements. However it will burn when heated in fluorine.
Which mineral is the hardest known-to-man?
Diamond is still the hardest substance known to man. Various carbides such as tungsten carbide, boron carbide, and silicon carbide are also extremely hard, but you will notice that they all contain carbon (diamond is pure carbon - the rest are carbon compounds.)
Is fluorine flammable and explosive?
Yes, its the most reactive element known to man.
Hardest substance known to man?
Diamond
What are Astronaut helmets made of?
Because gold is one of the least reactive substances know to man.
What is the finest substance known to man?
Talcum powder
What is the 2nd hardest substance known to man?
Diamond 10
What are at least this many minerals known to man?
2000
Is boron nitride the second hardest substance after diamond known to man?
YeS...
Can sandpaper scratch a diamond?
No, diamond's are the hardest substance known to man so far.
A is a pure substance that contains two or more electrons?
An element is a pure substance that contains two or more electrons. There are many different elements known to man.
Why are astronauts helmets made of gold?
Because gold is one of the least reactive substances know to man. It also looks good, bling bling sort of thing. www.lifetbh.worspress.com
What is the the hardest substance known?
The hardest substance on earth are things called Carbon Nanotubes. It's quite some times harder than diamond earning it well above a 10 on the Mohs Scale. This object is synthetic, being made by man. However, there is another substance called Rhenium diboride that is also harder than diamond; another from of a nanotube.
What are the least common elements on the periodic table?
the ones at the very bottom two rows (langthanides and actinides), which are separated from the rest of the table. Some of these are "man made" so to speak, and others are known to exist in theory, but have not been discovered. They are very reactive, often radioactive and do not usually exist as pure substances in the environment.
