Q4 of 70 Page 105

Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?

Electronic configuration of


Ag+ - [Kr] 4d10


Cu2+ - [Ar] 3d9


Zn2+ - [Ar] 3d10


Cu+ - [Ar] 3d10 4s1


Among the four ions, only Cu2+ has an unpaired electron in the d orbital which will give rise to coloured compounds.

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2

The electronic configuration of Cu(II) is 3d9 whereas that of Cu(I) is 3d10. Which of the following is correct?

 3

Metallic radii of some transition elements are given below. Which of these elements will have highest density?

Element Fe Co Ni Cu


Metallic 126 125 125 128


radii/pm


 5

On addition of sm 6

The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.