Parts of an Atom Proton, Neutron & Electron Proton (p+)

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Presentation transcript:

Parts of an Atom Proton, Neutron & Electron Proton (p+) -located inside nucleus -mass of 1 a.m.u. -positive (+) charge

Neutron (n) -located inside nucleus -mass of 1 a.m.u. -no charge or neutral Electron (e-) -located outside nucleus in “cloud” -mass of 0 a.m.u. -a negative (-) charge

# n 4 n in Li Li Li Li Atomic Number 3 Li 6.941 6.941 Li 3 Li 6.941 3 Atomic Number -the number of protons in one atom (Li = 3p+) All atoms are neutral so, # protons = # electrons (Li = 3e-) Atomic Mass -the number of p+ and n (Li = 6.941 p+ & n) added together -is the mass number when rounded (Li = 7 p+ & n) mass # (n & p+) 7 p+ & n - atomic # (# p+) - 3 p+ # n 4 n in Li

Bohr models e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- p+ & n in nucleus e- in energy levels around nucleus 3 energy levels -1st has up to 2e- -2nd has up to 8e- -3rd has up to 8e- e- e- e- e- e- e- e- e- e- e- e- e- e- e-

Bohr Model of Lithium e- e- e- 3 Li 6.941 3 4

e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- e- Bohr Model of Argon e- e- e- e- 18 Ar 39.948 e- e- e- e- 18 e- e- e- e- e- e- 22 e- e- e- e-