Andersen Dimon, John Banks, Cade DuBree, and Ian Livengood
Matter & Atoms
Bohr Models and Lewis Dot Structures
There are two main ways to represent the structure of an atom. The first diagram is known as the Bohr model. Niels Bohr's representation of an atom consists of drawing both the rings, or orbitals, of the atom along with the electrons on each ring. A maximum of two electrons fit on the first orbital, while the number of electrons that fit on each orbital after is eight. The number of protons and neutrons are written in the center of the atom. Compared to the Lewis Dot structure, the Bohr model is more complicated. In the Lewis Dot atom representation, the orbitals are not drawn, and the number of protons and neutrons are not included. Instead, the elements abbreviated name is written in the center, and the number of electrons on the outer most orbital are drawn around the element accordingly.
Ions and Isotopes
Atoms of a single element that have different numbers of neutrons are known as isotopes. They have the same number of protons but they have a different atomic mass. An example of this would be carbon. The normal atomic mass is 12, but carbon 14 or C-14 is an isotope that has a atomic mass of 14. An ion is when a molecule loses or gains electrons to balance the outer shell. When it is seen as O2- it means that the molecule gained two electrons, and when it is seen as O2+ it means that the molecule gained electrons.