How to Find the Valence Electrons for Arsenic (As)

There are two ways to find the number of valence electrons in Arsenic (As). The first is to use the Periodic Table to figure out how many electrons Arsenic has in its valence shell. To do so, look at the Group number (groups are the columns). Arsenic is in Group 15 (also called 5A) and therefore As has five valence electrons (not that this method doesn’t work for the Transition Metals). You can also look at the electron configuration to determine the number of valence electrons for Arsenic. The number of electrons in the highest energy level gives you the number of valence electrons. Using this method we’ll also determine that As has five valence electrons. Helpful videos: • Finding Valence Electrons (element): https://youtu.be/x1gdfkvkPTk • Finding Valence Electrons (molecule): https://youtu.be/VBp7mKdcrDk • How to Draw Lewis Structures: https://youtu.be/1ZlnzyHahvo Elements with the same number of valence electrons as Arsenic are Phosphorous and Nitrogen. Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).

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