Which region(s) of the periodic table contains elements that can adopt both positive and negative oxidation numbers?

The region(s) of the periodic table which contains elements that can adopt both positive and negative oxidation numbers would be the nonmetal region. As you look at the periodic table, you can see that some elements on the right side of the table would have two oxidation states written one positive and other a negative sign. 

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom