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to gain or lose electrons to become stable
neon is a noble gas and has the properties of the noble gases.
Noble gases are not reactiveHalogens are very reactive.
They are helium atoms and have all the properties of helium. Helium is mono-atomic [as are all of the noble gases] Non-noble gases [those gases that react with other elements/compounds] are diatomic meaning that in the gaseous state the atoms are paired on to another.
radon
Yes. all are mono atomic
Noble gases have larger atomic radii than alkali metals in the same period.
they have similar properties
The Noble Gases.
The noble gases from the least atomic number are, helium, neon, argon, krypton, xenon and redon.
Halogens are extremely reactive, noble gases are very unreactive. All noble gases are gases; only F and Cl are gases.
The noble gases, e.g. helium, argon, neon, etc. are monoatomic gases.