Question

number of total electron in d orbital of element having atomic number 78

Answer 1

Answer:

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Explanation:

Total number of d-electron present in an element having atomic number 78 is (1)8. (2)28. (3)29.

Answer 2

Correct Question:

The number of total electrons in d-orbital of an element having atomic number 78 is:

(1)8

(2)28

(3)29

(4)19

Correct Answer:

The total number of electrons present in the d-orbital of an element having atomic number 78 is:

(3) 29

- The element with atomic no 78 is Platinum.

- According to Afbau's principle:

Pt (78) = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², 4f¹⁴, 5d⁸

- But due to the extra ability, the actual configuration goes to:

Pt (78) = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶ 4f¹⁴, 5d⁹, 6s¹

- So, the no of total d-electrons = 10 + 10 + 9

Total d-electrons = 29