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Look to chapter 3 in your textbook, especially sections 3.7 and 3.8, for help with this assignment. Don't worry if you struggle to answer the questions–that is the plan! Remember, the intent of the web assignments is to make you stretch beyond what you currently know or have already figured out. In doing so, you will take yourself to the next level of understanding.

In addition to working on electron configurations and related concepts, this assignment includes an exam preparation check-up to help you gauge your preparation for the upcoming first exam.

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Electron Configurations

First, a couple of movies to help you with Chapter 3 concepts. A few reminders about the movies:

1. Two links are provided for each movie. You may have better luck with the alternate link if the first link for each movied doesn't work, If neither link works for you, you may want to try switching to a different web browser. Also, realize that because of the size of the files, it may not be feasible to view the movies from home if you have a slow connection (dial-up.)

2. If you don't hear the audio when the movie is playing, you will need to adjust the volume or deselect the "mute." If you are on campus, you may need to use headphones to listen to the movies. Remember, the audio is an important part of the movies.

3. Use the sliding control and the pause and play buttons to replay and review the movie if you want to.

Note: The first movie (#1) is fairly long. Movies 2, 3 and 4 are quite short and should load quickly if you have a fast connection.

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Electron Configuration Movie #1:

Using the periodic table to determine the order of filling of the orbitals.

link to movie #1 (deactivated in sample assignment)

alternate link to movie #1

 

Electron Configuration Movie #2:

Ground state electron configuration of a neutral N atom.

link to movie #2 (deactivated in sample assignment)

alternate link to movie #2

 

Electron Configuration Movie #3:

Ground state electron configuration of a neutral S atom (including shorthand notation.)

link to movie #3 (deactivated in sample assignment)

alternate link to movie #3

 

Electron Configuration Movie #4:

Isoelectronic--atoms and ions with the same electron configuration. Example: a neutral neon atom and a magnesium ion with a +2 charge.

link to movie #4 (deactivated in sample assignment)

alternate link to movie #4

 

Now some questions to answer. If you struggle with these, consider reviewing the movies OR refer to your lecture notes and your textbook for assistance.

1.	What is the maximum number of electrons that can be found in a single p orbital (or any single orbital)?
2.	How many electrons are needed to fill all of the 3p orbitals? (HINT: How many different "flavors" of p orbitals are there and how many electrons can go in each?)
3.	Order the following orbitals from lowest to highest energy: 4p, 3s, 2p, 3d, 4s. (HINT: Figure 3.5 provides some insight, but you should be able to do this using the periodic table.) Note: Only a subset of the orbitals is included in this question. If you were asked to place 2p, 4s and 1s orbitals in order of lowest to highest energy, the correct answer would be 1s < 2p< 4s.
4.	What neutral element has the following electron configuration? (HINT: How many electrons are shown in this electron configuration?) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
5.	What neutral element is represented by the following electron configuration? (HINT: How many electrons are shown in this electron configuration?)
6.	Write out the electron configuration of a neutral scandium atom. You can type 1s2 2s2 2p1 as 1s^2 2s^2 2p^1 etc.
7.	a. What is the electron configuration of S2- (HINT: How many protons does sulfur have? How many electrons would it have when it has a 2- charge? Now write the electron configuration for S2- using that number of electrons.)       b. What neutral element has the same electron configuration as S2- that you just wrote above?       c. What alkali metal with a +1 charge has this electron configuration too?

 

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Exam Preparation Check-up

The following is a list of activities that a student would do to be maximally prepared for the first exam. How are you doing? We are asking these questions to help you assess your progress. You might think of this as a "to do list" of tasks you can do to prepare for the exam. You will not be "graded" on your honest answers to the next set of questions.

1.	How often have you been reviewing your lecture notes?
		After every lecture. (best answer!)
		Every few days.
		I have occasionally.
		Never.

 

2.	How often have you been working through the examples and the problems within each chapter of the text? (For example, on page 57 in your text, Worked Example 3.6, Problem 3.16 & 3.17)
		After every lecture. (best answer!)
		Every few days.
		I have occasionally.
		Never.

 

3.

How many of the assigned homework questions have you done? Think before you respond. Have you really done what you need to, which is work through the questions yourself, or have you been spending a lot of time with the solutions manual, quietly saying, "yup, I could do that." HW 1: 14, 18, 23, 25, 28, 31, 37, 41, 44, 48, 50, 58 all 75% 50% 25% none HW 2a: 12, 36, 39, 41, 42, 44, 46, 47, 49, 53, 56, 59, 96 HW 2b: 61, 63, 64, 65, 66, 67, 68, 69, 70, 72, 86, 87b all 75% 50% 25% none HW 3a: 26, 35, 38, 42, 44, 47, 50, 61, 63, 100, 101 HW 3b: 31, 66, 68, 71, 73, 77, 78, 84, 102 all 75% 50% 25% none

 

4.	Have you looked at the old exams?
		Yes, I worked out answers to all the questions. (best answer!)
		Yes, I read through the questions.
		Not yet, but I plan to work out answers to all the questions.
		No.

 

5.	Have you checked out the "keys to success" on the C101 web site? You can find important information there that can help you do well in this class.
		Yes. (best answer!)
		Not yet, but I will soon.
		No, and I don't plan to. (worst answer!)

 

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We hope your studying is going smoothly and that you are well-prepared for the exam. Work hard. Your success on this exam is important!

 

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