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Drawing Atoms
Example 1: Magnesium
Protons
Neutrons
Electrons
Valence Electrons
12
12
12
2
(atomic number)
(Atomic mass – protons)
(Same as protons)
(electrons in the outermost shell)
Periodic Table Box
Bohr diagram
st
1 shell – 2 electrons
2nd shell – 8 electrons
3rd shell – 18 electrons
4th shell – 32 electrons
Valence shell - the outermost electron shell of an atom
Valence electrons – electrons in the last shell of an atom;
participate in chemical bonds
Lewis Dot Structure
Start by writing the chemical symbol.
Then add one dot for each valence electron.
Do not create pairs of electrons until all four sides have
an electron already.
Drawing Atoms
Example 2: Neon
Protons
Neutrons
Electrons
Valence Electrons
10
10
10
8
Periodic Table Box
(atomic number)
(Atomic mass – protons)
(Same as protons)
(electrons in the outermost shell)
Bohr diagram
Lewis Dot Structure
Homework:
Complete a chart, Bohr diagram, and Lewis Dot structure for Oxygen. Due
tomorrow.