Question

The group which belongs to transition series is
a) 2
b) 7
c) 13
d) 15

Answer 1

The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A.  They are sometimes called the d-block elements, since in this region the d-orbitals are being filled in, and are also referred to as B-group elements since in most numbering systems of the columns on the periodic table the numerals of these groups are followed by the letter B.  The period 4 transition metals are scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn).  The period 5 transition metals are yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), and cadmium (Cd).   The period 6 transition metals are lanthanum (La), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), and mercury (Hg).  The period 7 transition metals are the naturally-occurring actinium (Ac), and the artificially produced elements rutherfordium (Rf), dubnium (Db), seaborgium (Sg), bohrium (Bh), hassium (Hs), meitnerium (Mt), darmstadtium (Ds), roentgenium (Rg), and the as-yet unnamed ununbiium (Uub).

Answer 2

The correct option is b.

• The alkali earth metals belong to group 2.
• The transition metals reside at group 3 to group 12. Thus group 7 belongs to the transition series and has the transition elements Mn, Tc and Re.
• The elements from Boron to TI reside in group 13.
• The nitrogen family that is the elements from N to Sb belongs to group 15.