Parts Of The Atom Worksheet Page 2
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1
2*Here’s how to draw an atom of any element using the Bohr model of the atom:
Protons and neutrons go in the nucleus (center).
Electrons go in energy levels of the electron cloud.
The first energy level only holds up to 2 electrons.
The second energy level holds up to 8 electrons.
P =
The third energy level holds up to 18 electrons.
N =
Example for carbon: 6 electrons total
st
First 2 electrons in the 1
energy level
nd
Next 4 electrons in the 2
energy level
The electrons in the outermost energy level are called valence electrons (V.E.)
nd
Example for carbon: 2
energy level is the outermost energy level used by carbon
Carbon has 4 valence electrons
*Draw a picture of an atom for each of the first ten elements and write the number of valence electrons.
1. hydrogen
V.E._____
2. helium
V.E._____
3. lithium
V.E._____
4. beryllium
V.E._____
5. boron
V.E._____
6. carbon
V.E._____
7. nitrogen
V.E._____
8. oxygen
V.E._____
9. fluorine
V.E._____
10. neon
V.E._____
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