1. Quiz on the 1st 10 elements on the periodic table!!!
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Quiz on the 1st 10 elements on the periodic table!!!

2. Niel’s Bohr
In Bohr’s model electrons move around the nucleus like planets around the sun
Bohr was correct to assign energy levels to electrons, but they do not have a planetary orbit
Instead electrons are found in the electron cloud

3. Electron Clouds
The electron cloud is not a path that the electron follows but rather an idea of probability
At the denser (darker) parts of the cloud is where electrons are MOST likely to be found
The electron cloud is a representation of the orbitals around a particular atom

4. Valence Electrons Atoms may give/take/share e-’s
Closer to nucleus = higher energy e-
Tend to fill lowest levels first
Levels hold specific number of e-’s
Innermost = 2
Second = 8
Third = 18
Fourth = 32

5. Valence Electrons (cont.)
Outermost level = valence e-’s
Valence e-’s allow atoms to interact and form bonds
Number of valence e-’s determines the atom’s behavior
Elements with the same number of valence e-’s have the same behavior
Elements with full outer shells do not react

6. Electron Configuration
Energy levels have different types of orbitals in them
S-orbitals hold 2 electrons
P-orbitals hold 6 electrons
D-orbitals hold 10 electrons

7. Electron Configuration Rules
The row equals the energy level.
Exception: The “D” orbital is 1 less energy level than the row its on.
Read left to right, top to bottom.
If an orbital is full, you simply write it as full and do not include its constituent parts

8. Sodium – Na
Magnesium – Mg
Aluminum –Al
Silicon – Si
Phosphorus – P
Sulfur – S
Chlorine – Cl
Argon – Ar
Potassium – K
Calcium - Ca