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Go Figure

Go Figure. Valence electrons using electron configuration. ChemCatalyst. Consider the following electron configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 What element do you think is represented by this electron configuration?

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Go Figure

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  1. Go Figure Valence electrons using electron configuration

  2. ChemCatalyst Consider the following electron configuration: 1s22s22p63s23p64s23d104p4 What element do you think is represented by this electron configuration? How many valence electrons do you think this element has? Explain your reasoning. Unit 1 • Investigation III

  3. Another way to determine the order that subshells are filled

  4. The Big Question Where are the valence electrons in electron configurations? Unit 1 • Investigation III

  5. You will be able to: Write electron configurations and name valence electrons for an element. Unit 1 • Investigation III

  6. Activity Purpose: This activity teaches you a shorthand way to keep track of electron arrangements and how to identify valence electrons. (cont.) Unit 1 • Investigation III

  7. Determine # of valence electrons from the electron configuration • Any electron in the outermost s or p subshell is a valence electron • Any electron in the outermost unfilled d subshell can POSSSIBLY be a valence electron

  8. Unit 1 • Investigation III

  9. Valence electrons of transition metals • Sometimes, d subshell electrons behave like valence electrons. • The energy levels required for 3d and 4s (also 4d and 5s etc…) subshell are nearly the same amount • If there are 5 or less electrons in the d subshell, these can act like valance electrons under certain situations

  10. Info on transition valence electrons • If there are 6-8 electrons, only 1 d electron may act like a valence electron • If there are 9-10 no d electron acts like a valence electron

  11. What is the # of valence electrons for the following elements • Yttrium • Molybdenum • Ruthenium • Palladium • Silver • Cadmium

  12. Goal • In class complete the

  13. (cont.) (cont.) Unit 1 • Investigation III

  14. (cont.) (cont.) Unit 1 • Investigation III

  15. (cont.) Unit 1 • Investigation III

  16. Making Sense If you know the electron configuration of an element, what other information can you figure out? List at least six things. (cont.) Unit 1 • Investigation III

  17. Check-In Write the electron configuration for bromine, Br. Write the noble gas electron configuration for Br. How many valence electrons does Br have? Explain. Unit 1 • Investigation III

  18. Wrap-Up The noble gases can be used as placeholders in the periodic table when writing electron configurations. In the d-block or transition elements we find the rules determining valence electrons get more complicated. Unit 1 • Investigation III

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