Why was group 18 named as noble gases?
Octet electron configuration
Minute quantity in atmosphere
Chemical inactivity
Preparation of xenon and krypton compounds
Group 17 elements are called halogens because most them are
salts
one electron short of octet configuration
constituents of salt
exist in sea water
In electrolytic refining of Pb what accumulates to anode?
Impure lead
Pure lead
More electropositive impurities than Pb
Metallic impurities
Electronic confguratiion of group 18 elements?
ns2np4
ns2np3
ns2np5
ns2np6
