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81.

How many electrons are there in the valence quantum level of copper(Atomic, number = 29)?

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82.

The atomic number of a certain element is 17. Determine the number of electrons in each shell of the atom.

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(i) For 2p_x¹ electron:
n-2, l= 1, m =-1

(ii) For 3p_z electron:
n = 3, l= 1, m = + l

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84.

How many number of unpaired electrons are present in the ground state of Fe³⁺?(Atomic number of Fe is 26).

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85.

In which plane the probability of finding an electron residing in P_x orbital is zero?

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86.

Write the electronic configuration of Cr³⁺. (At. No. of Cr = 24)

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87. How are cathode rays produced? Explain briefly their important properties.

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88.

How can you say that electron is a universal constituent of all atoms?

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89.

What are anode rays? How do they originate? Briefly explain their important properties.

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90.

What is the difference in the origin of cathode rays and anode rays?

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