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...Cbse test paper chapter periodic classification of elements how does the valency vary in going down a group remains same b decreases c increases d first then many are placed lanthanide and actinide series answer questions on basis following table name family h he alkali alkaline earth metal halogen noble what is number valence electrons last element rd period x forms chloride with formula which solid high melting point would most likely to be as mg al si na chemically similar give electronic configuration second helium an unreactive gas neon extremely low reactivity if anything do their atoms have common periods groups present long form modern calcium atomic surrounded by these physical chemical properties resembling lithium sodium potassium all metals that react water liberate hydrogen there any similarity two you expect show kind magnesium for your choice write its find why regarded better than mendeleev s given below few parenthesis e i select has one electron outermost shell also t...