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Chapter 7: Problem 77

Explain what is meant by a noble gas core. Write the electron configuration of a xenon core.

Short Answer

Expert verified
A noble gas core refers to the core electron configuration of an atom, which mirrors that of the nearest noble gas with a lower atomic number. The electron configuration of a xenon core is \([Kr] 5s^2 4d^{10} 5p^6\).

Step by step solution

01

Understanding What a Noble Gas Core Is

A noble gas core refers to the inner electrons of an atom, which have the same electron configuration as the nearest noble gas with lower atomic number. Nobel gases are chemically stable, and hence their electron configurations are often referred to as 'noble gas cores'.
02

Writing the Electron Configuration of a Xenon Core

Xenon is a noble gas, and it has an atomic number of 54. When writing the electron configuration, we use the principle of building-up order or the Aufbau principle. Xenon's electron configuration is \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6\). This can be simplified by referring to the previous noble gas, Krypton (Kr), which saves the task of writing the complete electron structure that is identical to another noble gas. So, the configuration for Xenon is \([Kr] 5s^2 4d^{10} 5p^6\), where [Kr] represents the electron configuration of Krypton.

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Most popular questions from this chapter

What is the maximum number of electrons in an atom that can have the following quantum numbers? Specify the orbitals in which the electrons would be found. (a) \(n=2, m_{s}=+\frac{1}{2} ;\) (b) \(n=4, m_{\ell}=+1\) (c) \(n=3, \ell=2 ;\) (d) \(n=2, \ell=0, m_{s}=-\frac{1}{2} ;\) (e) \(n=4\) ,\(\ell=3, m_{\ell}=-2\)

Discuss the similarities and differences between a \(1 s\) and a \(2 s\) orbital.

What is a wave? Explain the following terms associated with waves: wavelength, frequency, amplitude.

What is an atomic orbital? How does an atomic orbital differ from an orbit?

Calculate the energies needed to remove an electron from the \(n=1\) state and the \(n=5\) state in the \(\mathrm{Li}^{2+}\) ion. What is the wavelength (in \(\mathrm{nm}\) ) of the emitted photon in a transition from \(n=5\) to \(n=1 ?\) The Rydberg constant for hydrogen-like ions is \((2.18 \times\) \(\left.10^{-18} \mathrm{~J}\right) Z^{2},\) where \(Z\) is the atomic number.
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