How many valence electrons does oxygen have?
Oxygen has 6 valence electrons.
A way to remember this is to note that it is in column 16 of the periodic table. For the representative elements (columns 1, 2, 13-18), the digit in the units place of the column number is the same as the number of valence electrons. Elements in column 1 have one valence electrons, elements in column 13 have 3 valence electrons, etc.
The 2 electrons on the top represent the