Suppose you throw a cube-shaped object and a spherical-shaped object of equal volume in the same volume of water. the ball sinks and the cube floats. which explains why this might be?

The surface area of the cube is greater than the surface area of the sphere which makes it more likely to float due to surface tension 

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