most reactive solid elements Li
most reactive liquid element Cs
most reactive gaseous element F
rarest element of earth astatine
poorest conductor of current Pb , S
metals showing highest oxidation state Ru Os
best conductor among non metals graphite
liquid on metal Br2
element kept in water P
rarest gas in atmosphere Rn
lightest gas in atmosphere H2
metal with highest mp W
heaviest solid metal Os
hardest naturally occuring non metal diamond
strongest basic oxide CsO2
lightest radio isotope Tritium
strongest reducing agent N3-
strongest Oxidising agent OF2
first nobel prize in chemistry Van't hoff
most abundant gas in universe H2 He
element with maximum no of isotopes Sn
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