Elements which show unique nature in the preparation of hydrogen are
Na, K, Li
Mg, Ca, Ba
Al, Zn, Pb
Fe, Cu, Ag

Which of the following sets belong to the same period ? Li, Na, K Li, Mg, Ca Cu, Ni, Zn F, Cl, Br.

Write the electronic configurations of following elements Li, N, Ne, P, Cl, Ca, Sc, Cr, Fe, Cu, Zn, Ag

The elements given below are arranged in order of increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K Pick two sets of elements which shows similar behaviour

The elements given below are arranged in order of increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K This arrangement of elements is an illustrator of which law of classification of elements.

Find the number of metals which are commercially reduced by self-reduction from the given metals : Fe, Al, Z, Sn, Pb, Hg, Cu .

Which among Na,Mg,Ba and Ca is the poor reducing agent?

How many of these metals carbon reduction is used during their extraction. Ag, Au, Fe, Sn, Zn, Pb, Al

Elements have been arranged in the following sequence on the basis of their increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl,Ar, K. (a) Pick two sets of elements which have similar properties (b) The given sequence represents which law of classification of elements ?

Which of the following are not representative elements ? Li, K, Al, Cu, Ne, Fe, S, Ce, Th

Which of the following sets of elements delays flowering if their concentration in plants is low? (a) N, K, Mg , S (b) N , S, P (c) Ca, Mg , Cu (d) N, S, Mo