Asteroids are relatively small to large chunks of celestial body that have dark surface. other asteroids are thought to be rocky and to have a core made of A. Iron or cobalt
B. Cobalt or Nickel
C. Nickel or Zinc
D. Iron or Nickel

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