This is a wildly pedantic point about the probabilistic nature of electron clouds.
When interpreting electrons as particles, the atom is mostly empty. The position of the electron is not known with certainty, but the number and mass of the electrons is and it is very small compared to the size of the entire atom. Volumetrically electrons are point particles and take up no space at all.
When interpreting electrons as quantum waves the term "empty" is largely meaningless.
When interpreting electrons as particles, the atom is mostly empty. The position of the electron is not known with certainty, but the number and mass of the electrons is and it is very small compared to the size of the entire atom. Volumetrically electrons are point particles and take up no space at all.
When interpreting electrons as quantum waves the term "empty" is largely meaningless.