Question

_{7. Give the ground-state electron configuration of (a) Rh3+ (b) Eu3+ (c). Mo6+ Show orbital diagram to find the number of unpaired electrons.}

_{8-Consider the process of shielding in atoms, using Be as an example. What is being shielded? What is it being shielded from? What is doing the shielding?}

_{9. Give the ground-state electron configuration along with total number of unpaired electrons of (a) Sc (b) V3+ (c) Mn2+(d) Cr2+ (e) Cu.}

Answer 1

7)

a) Rh³⁺ has electronic configuration [Ar]¹⁸3d⁶ and unpaired electrons 4.

b)Eu³⁺ has electronic configuration [Xe]⁵⁴4f⁶ and unpaired elctrons are 6.

c) Mo⁶⁺ has electronic configuration [Kr]³⁶4d⁰ and no unpaired electrons.

8 ) Shielding is process of hindrance of attraction force between postively charged nucleus and outermost shell or valance electrons.

Be (z=4) has 1S²2S² configuration.

The valance shell electrons i.e. 2S² experienced less electromagnetic force of attraction as inner shell electrons 1S² shielded the outer electrons. shielding of force of attraction on valance electron from nuclear charge.

9.)

a) Sc (z=21) has configuration. [Ar]¹⁸4S²3d¹

and 3 unpaired electrons .

b) V³⁺ has configuration [Ar]¹⁸3d¹ and 1 unpaired electron.

c) Mn²⁺ has configuration [Ar]¹⁸3d⁵ and 5 unpaired electrons.

d) Cr²⁺ has configuration of [Ar]¹⁸3d⁴ and has 4 unpaired electrons.

c) Cu has configuration of [Ar]¹⁸3d¹⁰4s¹ and one unpaired electron.

*for orbital digram in support to question 7.)

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