Yes made from Hydrogen, helium and Methane
Neptune is made up of: 74% hydrogen, 25% helium and 1% methane.
Atmosphere
yes
uranus
it has an amosphere+
Yes, but extremely rarefied.
it has an amosphere+
kbuyujkn
the amosphere of the plain was arid, and many were coughing with dust
Yes, however it is very thin and only has about 0.6% of the pressure as Earth. It is also over 95% carbon dioxide.
Nitrogen is not a metal, it is a gas which forms large percentage of the earth's amosphere.
Earth has a relatively thin atmosphere, and I believe that Mars has one even thinner (both in height and density).