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Chapter 29: Problem 31

Predict the ground-state electron configurations of \(\mathrm{Mg}, \mathrm{Sr}\), and \(\mathrm{Ba}\).

Short Answer

Expert verified
The ground-state electron configurations for Mg, Sr, and Ba are \[1s^2 2s^2 2p^6 3s^2\], \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2\] and \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6 6s^2\] respectively.

Step by step solution

01

Identify the Atomic Numbers

Find the atomic numbers of Mg (Magnesium), Sr (Strontium), and Ba (Barium) because the atomic number equals the number of electrons in a neutral atom. From the periodic table, the atomic numbers for Magnesium, Strontium and Barium are \(12\), \(38\), and \(56\) respectively.
02

Write out the Electron Configuration

Using the Aufbau principle, write out the electron configuration. For Magnesium, this would look like: \[1s^2 2s^2 2p^6 3s^2\]For Strontium, this would look like: \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2\]For Barium, this would look like: \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^6 6s^2\]

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Most popular questions from this chapter

Identify the element for each of these electron configurations. Then determine whether this configuration is the ground state or an excited state. a. \(1 s^{2} 2 s^{2} 2 p^{5}\) b. \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p\)

The Paschen series is analogous to the Balmer series, but with \(m=3 .\) Calculate the wavelengths of the first three members in the Paschen series. What part(s) of the electromagnetic spectrum are these in?

When all quantum numbers are considered, how many different quantum states are there for a hydrogen atom with \(n=1 ?\) With \(n=2 ?\) With \(n=3 ?\) List the quantum numbers of each state.

Write the symbol for an atom or ion with a. Four electrons, four protons, and five neutrons. b. Six electrons, seven protons, and eight neutrons.

The energy of a hydrogen atom is \(12.09 \mathrm{eV}\) above its groundstate energy. As a multiple of \(\hbar,\) what is the largest angular momentum that this atom could have?
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