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21. Write ground-state electron configurations for the
following elements. (Orbital Diagrams)
a) bromine (Br)
↑↓
1s2
↑↓
4s2
↑↓ ↑↓ ↑↓ ↑↓
2s2 2p6
↑↓ ↑↓ ↑↓ ↑↓ ↑↓
3d10
↑↓ ↑↓ ↑↓ ↑↓
3s2 3p6
↑↓ ↑↓ ↑
4p5
[Ar]4s23d104p5
4s24p5
[1s22s22p63s23p6] 4s23d104p5
4p5
strontium (Sr)
↑↓
1s2
↑↓
4s2
↑↓ ↑↓ ↑↓ ↑↓
2s2 2p6
↑↓ ↑↓ ↑↓ ↑↓ ↑↓
3d10
↑↓ ↑↓ ↑↓ ↑↓
3s2 3p6
↑↓ ↑↓ ↑↓ ↑↓
4p6
5s2
[1s22s22p63s23p64s23d104p6 ]5s2
[Kr]5s2
5s2
5s2
antimony (Sb)
↑↓ ↑↓ ↑↓ ↑↓ ↑↓
1s2 2s2 2p6
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4s2 3d10
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑ ↑
4d10
5p3
↑↓ ↑↓ ↑↓ ↑↓
3s2 3p6
↑↓ ↑↓ ↑↓ ↑↓
4p6
5s2
↑
[1s22s22p63s23p64s23d104p6 ] 5s24d105p3
[Kr]5s24d105p3
5s25p3
5p3
rhenium (Re)
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
1s2 2s2 2p6
3s2 3p6
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4s2 3d10
4p6
5s2
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4d10
5p6
6s2
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑ ↑ ↑ ↑ ↑
4f14
5d5
[1s22s22p63s23p64s23d104p6 5s24d105p6 ]6s24f145d5
[Xe]6s24f145d5
6s25d5
5d5
terbium (Tb)
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
1s2 2s2 2p6
3s2 3p6
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4s2 3d10
4p6
5s2
↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4d10
5p6
6s2
↑↓ ↑↓ ↑ ↑ ↑ ↑ ↑
4f9
[1s22s22p63s23p64s23d104p6 5s24d105p6]6s24f9
[Xe]6s24f9
6s24f9
4f9
titanium (Ti)
↑↓
1s2
↑↓
4s2
↑↓ ↑↓ ↑↓ ↑↓ ↑↓
2s2 2p6
3s2
↑ ↑
3d2
[ 1s22s22p63s23p6] 4s23d2
↑↓ ↑↓ ↑↓
3p6
[Ar]4s23d2
4s23d2
3d2
22. A chlorine atom in its ground state has a total of
seven electrons in orbitals related to the atom’s third
energy level.
↑↓
1s2
↑↓
2s2
↑↓ ↑↓ ↑↓
2p6
↑↓
3s2
↑↓ ↑↓ ↑
3p5
How many of the seven electrons occupy p orbitals?
5
How many of the 17 electrons in a chlorine atom occupy
p orbitals?
11
23. When a sulfur atom reacts with other atoms,
electron s in orbitals related to the atom’s third
energy level are involved. How many such electrons
does a sulfur atom have?
Sulfur (16 electrons) has the electron
configuration [Ne]3s23p4.
Therefore, 6 electrons are in orbitals related to
the third energy level of the sulfur atom
24. An element has the ground-state electron
configuration [Kr]5s24d105p1. It is part of some
semiconductors and used in various alloys. What
element is it?
Indium (In)

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