Which of the following are considered noble gases Chlorine Bromine Neon Argon?

Answer 1

Neon and Argon are "noble gases" which are stable as single atoms - in fact it is extremly difficult to form polyatomic molecules that include any of the noble gases. The total list of "noble gases" in order of asceding atomic weights: Helium, Neon, Argon, Krypton, Xenon, and Radon. In theory, there might be another "noble gas" at atomic number 118 (temporary IUPAC name "Ununoctium", but the radioactive ununoctium atom is very unstable, and since 2002, only three atoms (possibly four) of the isotope 294Uuo have been detected. Obviously not much is known about that element but some theoretical calculations have been made which make some interesting predictions about it including that it is probably NOT a noble gas like all the other elements in the same column of the Periodic Table, i.e. helium, neon, etc. It was originally predicted to be a gas but is now predicted to be a solid under normal room temperature and pressue.

Chlorine and Bromine are halogens and are stable as diatomic molecules, i.e. Cl2 and Br2, at normal room temperature and pressure.