Atomic Structure An atom is the smallest unit of matter

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Presentation transcript:

Atomic Structure An atom is the smallest unit of matter Proton: + charge in nucleus Neutron: no charge in nucleus Electron: - charge outside of nucleus Each outer ring is an orbital or shell 1st shell holds a max of 2 e- 2nd shell holds a max of 8 e- 3rd shell holds a max of 18 e- The Atomic # tells you how many protons there are. In most cases it is also the number of electrons The Atomic Mass is the average number of protons + the number of neutrons Isotopes have a different # of Neutrons than protons