In general the law of superposition states that in an ynderformed sequence of sedimentary rocks each layer is blank
basically the same age
older tha the one above it
older than the one below it
thicker than the one above it

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.