Atoms And Elements Worksheet Page 10
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18Practice 2-43
How many orbitals exist in the third energy level? What are they?
Answer
Total of 9 orbitals.
3s (ONE orbital), 3p (THREE orbitals) , and 3d (FIVE orbitals).
Electron Configuration
The distribution of electrons in atomic orbitals is called the atom electron configuration .
Orbitals fill in the order of increasing energy from lowest to highest. See Figure 2.1.
Orbital
energies: 1s < 2s < 2p < 3s < 3p< 4s< 3d < 4p < 5s < 4d < 5p < 6s……
____ ____ ____
5p
5p
5p
____ ____ ____ ____ ____
4d
4d
4d
4d
4d
____
5s
____ ____ ____
4p
4p
4p
____ ____ ____ ____ ____
3d
3d
3d
3d
3d
____
e
4s
n
____ ____ ____
e
3p
3p
3p
r
____
g
3s
y
____ ____ ____
2p
2p
2p
____
2s
____
1s
Figure 2.1
Approximate relative energies of atomic orbitals. Electrons fill orbitals in the
order of increasing energy.
2-10
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