Question

The total number of elements in the Group IB is:
A.4
B.5
C.7
D.9

Answer 1

Group IB consists of elements Copper (Cu), Silver (Ag), Gold (Au) and Roentgenium (Rg)

Complete step by step answer:
A group is a vertical column of the periodic table which is based on the organization of the outer shell electrons.
Group IB occupies the middle of the periodic table between Group IIA and Group IIIA. It consists of 4 elements namely Copper (Cu), Silver (Ag), Gold (Au) and Roentgenium (Rg). They are also known as ‘Coinage metals.
Therefore, the correct answer is option (A).

Note: Copper is a reddish and a lustrous metal. It is malleable, ductile and a good conductor of heat and electricity. Silver occurs in ores such as argentite and horn silver. It has brilliant white metallic luster. It is harder than gold and is very ductile, malleable. It has the highest thermal conductivity of all metals. It is stable in pure air and water. Gold occurs in veins and alluvial deposits and is separated from rocks often. It is used in coinage and it is a standard for monetary systems in many countries. Gold in its pure state is metallic having a yellow color. It is a good conductor of heat and electricity. Roentgenium was discovered in 1994. This name given to the element was proposed by the GSI team in honor of the German physicist, Wilhelm Conrad Rontgen.
Group 1B elements are more stable than the Group 1A elements because of higher ionization energies resulting from incomplete shielding of the nucleus by the inner d electrons, Consequently, the outer s electrons of the Group 1B elements are more strongly attracted by the nucleus.