Into to valance electrons

Energy Levels

• Often referred to as the "planetary" model

• This is because it models the electrons as orbiting the nucleus like the planets orbit the sun.

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2. 8. 18. 32. 32. 18. 2

aren't you glad you only have to know the first 4 levels & the OCTET RULE!!!!

Atoms tend to form compounds that give them EIGHT valence electrons and thus the electron configuration of a noble gas.

of electrons is in the case of the first noble gas, helium, which only has two valence electrons.

they determine how reactive an element is...

• Dots represent valence electrons. Place the dots around the element.

• Keep dots separate until you have to double up.

• check your work.