Q1 of 70 Page 105

Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?

X is in +3 oxidation state which means the X3+ has formed by the loss of 3 electrons. So the ground state electronic configuration is [Ar]3d64s2. The atomic number is equal to the number of electrons in a neutral atom, so it is 18+6+2=26.

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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


 4

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

 5

On addition of sm