Graphing Calculator Calculating the Number of Valence Electrons The graphing calculator can run a program that can determine the number of valence electrons in an atom, given its atomic number. Go to Appendix C. If you are using a TI-83 Plus, you can download the program VALENCE and run the application as directed. If you are using another calculator, your teacher will provide you with keystrokes to use. After you have run the program, answer these questions. How many valence electrons are there in the following atoms? \begin{equation} \begin{array}{l}{\text { a. Rutherfordium, Rf, atomic number } 104} \\ {\text { b. Gold, Au, atomic number } 79} \\ {\text { c. Molybdenum, Mo, atomic number } 42} \\ {\text { d. Indium, In, atomic number } 49}\end{array} \end{equation}

Step by step solution

01

Run the Program

Open and run the VALENCE program on the graphing calculator. If you are using a different type of calculator, follow the alternative keystrokes provided by the teacher.

02

Enter Atomic Number

Enter the atomic number of the atom when the program prompts you to do so. For Rutherfordium, enter 104, for Gold, enter 79, for Molybdenum, enter 42 and for Indium, enter 49. Respectively repeat these steps for each atom.

03

Note Valence Electrons

After entering the atomic number, the program will display the number of valence electrons for each atom. For example, for Rutherfordium the number of valence electrons is 4 (in accordance with its position in the 4th group of the periodic table), for Gold it is 1 (as it is in the first group), for Molybdenum it is 6 (as it is in the 6th group) and for Indium it is 3 (as it is in the 3rd group). Remember that the group number of an element in the periodic table often corresponds to the number of valence electrons.

04

Answer Questions

After obtaining the values from the calculator, write down the number of valence electrons for each atom as the answer.

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