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Chapter 7: Problem 88

Use the Aufbau principle to obtain the ground-state electron configuration of technetium.

Short Answer

Expert verified
The ground-state electron configuration of Technetium is 1s\(^2\), 2s\(^2\), 2p\(^6\), 3s\(^2\), 3p\(^6\), 4s\(^2\), 3d\(^{10}\), 4p\(^6\), 5s\(^2\), 4d\(^5\).

Step by step solution

01

Understanding Technetium's Atomic Number

Technetium is the 43rd element on the Periodic table, so it has 43 electrons in its ground state.
02

Aufbau Principle Application

The Aufbau principle stipulates that lower energy orbitals are filled before higher energy orbitals. The order for filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, and 6d. Using this sequence, fill up the energy levels until there are no more electrons left.
03

Implementation For Technetium

Follow the order of the Aufbau principle until all 43 electrons are used up. The electron configuration becomes: 1s\(^2\), 2s\(^2\), 2p\(^6\), 3s\(^2\), 3p\(^6\), 4s\(^2\), 3d\(^{10}\), 4p\(^6\), 5s\(^2\), 4d\(^5\).

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Most popular questions from this chapter

A laser is used in treating retina detachment. The wavelength of the laser beam is \(514 \mathrm{nm}\) and the power is \(1.6 \mathrm{~W}\). If the laser is turned on for \(0.060 \mathrm{~s}\) during surgery, calculate the number of photons emitted by the laser. \((1 \mathrm{~W}=1 \mathrm{~J} / \mathrm{s})\)

What is the difference between a \(2 p_{x}\) and a \(2 p_{y}\) orbital?

In a photoelectric experiment a student uses a light source whose frequency is greater than that needed to eject electrons from a certain metal. However, after continuously shining the light on the same area of the metal for a long period of time the student notices that the maximum kinetic energy of ejected electrons begins to decrease, even though the frequency of the light is held constant. How would you account for this behavior?

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What is electron configuration? Describe the roles that the Pauli exclusion principle and Hund's rule play in writing the electron configuration of elements.
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