# Experiment _7_ Understanding Electron Configurations

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```					Experiment #7: Understanding Electron Configurations

Purpose:   Formulate the electron configurations of many elements. Relate electron configurations of elements to the periodic table.

Introduction: The electrons in an atom occupy distinct energy levels. These energy levels are subdivided into sublevels, differentiated by the letters s, p, d and f. Within each sublevel, there are a specific number of orbirtals, each capable of accommodating two electrons. To determine the electron configuration of any atom, start with the lowest energy orbital, and fill orbitals in the order of increasing energy. When all the electrons of a given element have been placed according to the increasing energy of the orbitals, the electron configuration can be written out as illustrated for chlorine. Chlorine Cl 17 electrons 1s22s22p63s23p5

Procedure:

1. You will be a member of a group for this experiment. Each person in the group will be assigned between 12 and 16 elements. The whole group will be responsible for 48 elements. 2. For each of the elements you have been assigned, you need to complete the electron configuration grid. 3. Cut the electron configuration grid into pieces so that only one element is on each piece of paper. 4. Using all 48 elements, the members of the group will work together to answer the Analysis and Conclusion questions.

Element Name: ________________________ Element Symbol: _____________ Atomic Number: _____________

Electron Configuration Notation:

Element Name: ________________________ Element Symbol: _____________ Atomic Number: _____________

Electron Configuration Notation:

Element Name: ________________________ Element Symbol: _____________ Atomic Number: _____________

Electron Configuration Notation:

Element Name: ________________________ Element Symbol: _____________ Atomic Number: _____________

Electron Configuration Notation:

ANALYSIS AND CONCLUSIONS: 1. Find ALL of the elements that end with a single s electron (either 1s1, 2s1, 3s1, 4s1, 5s1, 6s1, or 7s1). (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table? 2. Find ALL of the elements that end with two s electrons (either 1s2, 2s2, 3s2, 4s2, 5s2, 6s2, or 7s2). (a) What are the symbols of these elements?

(b) Where are most of these elements located on the periodic table?

(c) Which element is the exception? 3. Find all the elements whose electron configuration ends with p1 (either 2 p1, 3p1, 4p1, etc. ) (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table? 4. Find all the elements whose electron configuration ends with p3 (either 2 p3, 3p3, 4p3, etc.) (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table? 5. Find all the elements whose electron configuration ends with p6 (either 2 p6, 3p6, 4p6, etc.) (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table?

(c) Which element appears out of place? 6. Find all the elements that end with d electrons. (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table?

7. Find all the elements that end with f electrons. (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table? 8. Find ALL the elements whose highest energy level is the 3rd energy level. (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table? 9. Find ALL the elements whose highest energy level is the 4th energy level. (a) What are the symbols of these elements?

(b) Where are these elements located on the periodic table?

10. A scrap of paper with the electron configuration of an element was picked up off the floor. It was incomplete, but the last thing listed with 5p66s1. (a) What is the element’s complete electron configuration?

(b) What is the name and symbol for this element?

11. Explain what is wrong with the electron configurations written below: (a) 1s22s22p83s23p3

(b) 1s22s22p63s23p63d2

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