Atoms And Elements Worksheet Page 16
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18Worked Example 2-7
Use the periodic table to write the electron configuration for arsenic, As.
Solution
Arsenic is element 33 in Period 4, Group VA, three places after the transition
elements. It must contain three electrons in the 4p orbitals.
Its electron configuration is
2
2
6
2
6
2
10
3
As: 1s
2s
2p
3s
3p
4s
3d
4p
Practice 2-7
Use the periodic table to write both the electron configuration and the shorthand
notation for iodine.
Answer
2
2
6
2
6
2
10
6
2
10
5
I: 1s
2s
2p
3s
3p
4s
3d
4p
5s
4d
5p
2
10
5
I: [Kr] 5s
4d
5p
2-16
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