If an atom of oxygen has an atomic number of eight that means...… E. there are 8 protons
F. there are 8 neutrons
G. it weighs 8 amu
H. it is in group 8

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

k2s for potassium sulphide