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◦ Number of shells (period #) ◦ Number of valence electrons (group #) Valence electrons are electrons in the outer shell ◦ Total number of electrons
1
2 13 1 4 1 5 1 6 1 7
1 8
1 2 3 4 5 6 7 6 7
Transition Metals
Period 1 = 1 Electron Shell
Period 2 = 2 Electron Shells
Period 3 = 3 Electron Shells
Period 4 = 4 Electron Shells
Period 5 = 5 Electron Shells
Period 6 = 6 Electron Shells
Period 7 = 7 Electron Shell
Period 6 = 6 Electron Shells
Period 7 = 7 Electron Shells
1 Valence Electron 2 Valence Electron 3 Valence Electron4 Valence Electron 5 Valence Electron 6 Valence Electron7 Valence Electron8 Valence Electron
1 per
2 per 3 per
Which
element is
this?
Helium
◦ Osmium
◦ Gold ◦ Silver
◦ Radium
