Normal laboratory equipment cannot weigh a single atom, but can easily weigh a mole of atoms. In addition, masses of individual atoms are very small, and cumbersome to manipulate in normal calculations. Thus, we use moles of atoms, because these numbers parallel atomic weights, and are easily manipulated. Briefly describe the Bohr model of the atom. At the center of the Bohr atom is a very dense area of positive charge, the nucleus.
Electrons orbit the nucleus in circular orbits, much like plants orbit the sun.
The energy of these photons are exactly equal to the energy differences of the orbitals. Describe one key feature of the Bohr model of the atom which is consistent with the gas emission spectra observed in class. The Bohr model predicts that electrons will orbit the nucleus in certain descreet, quantized energy levels. Because only certain orbits are allowed, only certain photons will be emitted. These are seen as the narrow bands of color in the spectra observed in class.