write the name and atomic number of six noble gases which were known since long.Also write IUPAC name of the recently discovered noble gases. which of these 7 noble gases are expected to be raioactive.?
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Solution
Helium, He - 2 Neon, Ne - 10 Argon, Ar - 18 Krypton, Kr - 36 Xenon, Xe - 54
Radon, Rn - 86
Ununoctium is newly discovered noble gas, atomic number - 118.
Radon is radioactive.