Electron Configuration from the Periodic Table

Periodic Table helps you determine the filling order.

Using The Periodic Table to Write Electron Configuration Start at Hydrogen. This is 1s1. Then go to Helium, this is 1s2. Each box counts as the next electron in that sublevel. Once you reach the end of the sublevel, write this down on your paper. Continue to follow the periodic table, writing down the configuration as you go. Stop when you get to the element you are writing the electron configuration for.

Write the Electron Configurations Si Ar Ca

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Finding Valence Electrons from the Electron Configuration The valence electrons are the electrons in the outermost energy level. Find the highest energy level (The numbers) Count the electrons in all sublevels (the letters) of this energy level. Example: 1s22s22p63s23p64s23d104p2 2 + 2 = 4 valence electrons

Example How many valence electrons do the following elements have? 1s22s22p63s23p64s23d9 1s22s22p2 1s22s22p63s23p64s23d104p4 1s22s22p63s23p64s23d104p65s24d4

Example: How many core electrons do the following elements have? 1s22s22p63s23p1 1s22s22p63s23p64s23d1 1s22s22p4 1s22s22p63s23p5

Example What type of orbital are the valence electrons in for the following elements: Na Cu O Ce