(i) State the group number in modern periodic table where solid, liquid and gaseous elements are present at room temperature. Identify solid, liquid element. (ii) Indicate the given elements as alkali metal, alkaline-earth metal, coinage metal, chalcogen: Li, Ca, S,Cu.

(i) State the group number in modern periodic table where solid, liqui

1.	(i) State the group number in modern periodic table where solid, liquid and gaseous elements are present at room temperature. Identify solid, liquid element. (ii) Indicate the given elements as alkali metal, alkaline-earth metal, coinage metal, chalcogen: Li, Ca, S,Cu.
Answer» Solution :(i) Group-17 of modernn PERIODIC table contain solid (iodine `I_(2)`), liquid (bromine, `Br_(2)`) and GASEOUS (chlroine, `Cl_(2)`) elements as the same time. (II) Li-alkali METAL, Ca-alkaline earth metal, S- chalcogen, Cu-coinage metal.