Question

Noble Gases (18): (Name all noble gases)

• These elements do not easily combine with other elements. They are odorless, colorless and therefore were difficult to discover.

• When air is cold, Oxygen liquefies first at -18O Celsius. about 1% of the air is still gas composed of the noble gas __(Name entire noble gas name)____, ___(Name short version of Noble gas name)___.

• One noble gas was discovered on the sun. It’s spectrum was identify first. This is _____, __.

• One of noble gas is radioactive and seeps up your basement floors and walls. It is _____, __.

• This noble gas is used in electronic flashes and other bright lights. It is ____, __.

• This noble gas is best known for its orange color in gas discharge tubes. It is used for signs that bear its name. It is ____, __.

Answer 1

• The Noble gasses are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn).

• When air is cold, Oxygen liquefies first at
  `-182^oC`.
  `N_2` liquefies at
  `-195^oC`. About 1% of the air is still gas composed of the noble gas Argon, Ar.
• One noble gas was discovered on the sun. It’s spectrum was identify first. This is Helium, He.
• One of noble gas is radioactive and seeps up your basement floors and walls. It is Radon, Rn.
• This noble gas is used in electronic flashes and other bright lights. It is Xenon, Xe.
• This noble gas is best known for its orange color in gas discharge tubes. It is used for signs that bear its name. It is Neon, Ne.