Q. 85.0( 2 Votes )

(a) Which two cri

Answer :

(a) Mendeleev used following two criteria to arrange elements in the periodic table:

1. The elements were arranged around to their increasing atomic masses.


2. He grouped elements having similar properties together.


(b) (i) The most reactive non-metal of period '3' of the modern periodic table is Chlorine (Cl).


(ii) The most reactive non-metal of period '3' of the modern periodic table is Sodium (Na).


(iii) The element in period 3 which forms ions with -2 charge is Sulphur (S).


(iv) The element in period 3 which forms ions with +2 charge is Magnesium (Mg).


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