If solid nickel metal were mixed with cobalt ion, what would you expect to see happen?
A. solid cobalt would form
B. nickel ions would form
C. cobalt would be oxidized
D. nothing

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

The correct answer is "hydrogen".