Elements
The elements helium, copper, neon and argon are commonly referred to as noble gases. These are mainly obtained from air in an air separation unit.
Helium, Neon, Argon, Krypton, Xenon, and Radon.helium (studyisland answer)
Helium, neon, and argon are the three lightest members of the noble gases.
The first four are (in order of increasing number / mass: He = Helium, Ne = Neon, Ar = Argon, Kr = Krypton Xe = Xenon and Ra = Radon are the other two noble gases
helium argon krypton xenon radon
helium neon argon krypton xenon radon
Helium, argon, and neon are noble gases with different atomic numbers: helium (2), neon (10), and argon (18). They vary in terms of their densities, boiling points, and chemical reactivity. Neon has the lowest boiling point and argon has the highest atomic weight among the three.
Helium - He, Neon - Ne, Argon - Ar, Krypton - Kr and Radon - Ra are the noble gases.
Noble gases
They are all gases.
Helium Neon and Argon The noble gas group contain: helium, neon, argon, krypton, xenon, radon, ununoctium.
Helium and neon do not typically react with iron under normal conditions. Argon is inert and does not chemically react with iron.