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An Intiative by Sri Chaitanya
a
Hydrogen and helium are placed in the periodic table against the commonly followed system.
b
Hydrogen is similar in many properties with alkali metals (1st group) as well as halogens (17th group).
c
Hydrogen has been placed at the top of periodic table as well as in 1st and 17th groups.
d
Hydrogen has only one electron in valence shell similar to alkali metals and can again one electron similar to halogens.
answer is C.
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