11 grade chemistry others
The 71st electron of an element X with atomic number 71 enters which orbital?
A. 4f
B. 6p
C. 6s
D. 5d
The 71st electron of an element X with atomic number 71 enters which orbital?
A. 4f
B. 6p
C. 6s
D. 5d
1 Answer
Askiitians Tutor Team
To determine the electron configuration of the {71^{{\text{st}}}} electron of an element X with an atomic number of 71, we need to follow the Aufbau principle and fill the electron orbitals in the order of increasing energy levels.
The electron configuration of an element with atomic number 71 (X) is as follows:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁹ 6p¹
Now, let's determine where the {71^{{\text{st}}}} electron enters. Counting the electrons in each sublevel:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁹ 6p¹
↑ ↑
We find that the {71^{{\text{st}}}} electron enters into the 6p orbital.
So, the correct answer is:
B. 6p
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