:my teacher posted this question  for extra points: "before mount everest was discovered, what was the highest mountain on earth? " i searched everywhere and still couldn't find the !

81 is a composite number.

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.