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Chapter 41: Q. 15 (page 1207)

What is the electron configuration of the second excited state of lithium?

Short Answer

Expert verified

The electronic configuration of second excited state for lithium atom is1s23s1

Step by step solution

01

Step 1. Given information

The number of possible electrons in sorbital (or shell) is 2 ,

the number of possible electrons in porbital (or shell) is 6 ,

the number of possible electrons in orbital (or shell) is 10,

and the number of possible electrons in gorbital (or shell) is 14 .

02

Step 2. Explanation

We must determine the electron configuration of lithium's second exited state.

In the ground state, the lithium atom (Z= 3) contains two electrons in the 1s shell and one electron in the 2s shell.

For the first excited state of lithium, the electron configuration is:

1s22p

As a result, the electron configuration for lithium's second excited state is:

1s23s

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Most popular questions from this chapter

Suppose you have a machine that gives you pieces of candy when you push a button. Eighty percent of the time, pushing the button gets you two pieces of candy. Twenty percent of the time, pushing the button yields 10pieces. The average number of pieces per push is Navg=2×0.80+10×0.20=3.6. That is, 10pushes should get you, on average, 36pieces. Mathematically, the average value when the probabilities differ is Navg=∑(Ni×Probabilityofi). We can do the same thing in quantum mechanics, with the difference that the sum becomes an integral. If you measured the distance of the electron from the proton in many hydrogen atoms,

you would get many values, as indicated by the radial probability density. But the average value of rwould be

ravg0=∫0∞rPr(r)dt

Calculate the average value of rin terms of aBfor the electron in the 1sand the 2pstates of hydrogen.

Show that hc=1240eVnm.

A ruby laser emits a 100MW, 10-ns-long pulse of light with a wavelength of 690nm. How many chromium atoms undergo stimulated emission to generate this pulse?

When all quantum numbers are considered, how many different quantum states are there for a hydrogen atom withn=1? Withn=2? Withn=3? List the quantum numbers of each state.

What is the angular momentum of a hydrogen atom in

(a) a 6sstate and

(b) a 4fstate? Give your answers as a multiple of U.
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