Atoms And Elements Worksheet Page 11
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18Writing Electron Configurations (Orbital Notations)
We describe an electron configuration by listing the symbols for the occupied sublevels
one after another, adding a superscript to each symbol to show the number of electrons in
the sublevel. For example, nitrogen in its lowest energy state has two electrons in its 1s
sublevel, two electrons in its 2s sublevel, and three electrons in its 2p sublevel.
2
2
3
The notation for this configuration is: 1s
2s
2p
.
number of electrons
energy level
3
p
2
energy sublevel
Worked Example 2-4
Write the electron configuration for an atom of bromine (Br).
Solution
The correct filling order of atomic orbitals from Fig 2.1 is
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p ………….
s orbital can hold 2 electrons, p orbitals 6, d orbitals 10, and f orbitals 14
electrons.
Bromine is element 35 and therefore contains 35 electrons. The electron
configuration is
2
2
6
2
6
2
10
5
1s
2s
2p
3s
3p
4s
3d
4p
Practice 2-5
Give the electron configuration for each of the following: Mg, P, Cl, and Ca.
Answer
2
2
6
2
Mg: 1s
2s
2p
3s
2
2
6
2
3
P: 1s
2s
2p
3s
3p
2
2
6
2
5
Cl: 1s
2s
2p
3s
3p
2
2
6
2
6
2
Ca: 1s
2s
2p
3s
3p
4s
2-11
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