Which of these is an element?
a)air
b)carbon dioxide(co2)
c)water(h20)
d)carbon(c)

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

Do you have any options for this question?

The answer is solid copper