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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 Valence electrons using electron configuration
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
Another way to determine the order that subshells are filled
The Big Question Where are the valence electrons in electron configurations? Unit 1 • Investigation III
You will be able to: Write electron configurations and name valence electrons for an element. Unit 1 • Investigation III
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
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
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
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
What is the # of valence electrons for the following elements • Yttrium • Molybdenum • Ruthenium • Palladium • Silver • Cadmium
Goal • In class complete the
(cont.) (cont.) Unit 1 • Investigation III
(cont.) (cont.) Unit 1 • Investigation III
(cont.) Unit 1 • Investigation III
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
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
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