Electron Configurations And Orbital Diagrams Key Page 2
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1
2Write the electron configuration (full, and in core notation) for the following ions:
-1
+3
1.
Br
13. Cu
2
2
6
2
6
10
2
6
+4
2
2
6
2
6
8
7.
Sn
1s
2s
2p
3s
3p
3d
4s
4p
1s
2s
2p
3s
3p
3d
10
2
6
8
2
2
6
2
6
10
2
6
10
10
[Kr], [Ar] 3d
4s
4p
[Ar] 3d
1s
2s
2p
3s
3p
3d
4s
4p
4d
[Kr] 4d
+2
+3
+1
2. Sr
14. Fe
8. Ag
2
2
6
2
6
10
2
6
2
2
6
2
6
5
2
2
6
2
6
10
2
6
10
1s
2s
2p
3s
3p
3d
4s
4p
1s
2s
2p
3s
3p
3d
1s
2s
2p
3s
3p
3d
4s
4p
4d
10
2
6
5
10
[Kr], [Ar] 3d
4s
4p
[Ar] 3d
[Kr] 4d
-2
+2
+2
3. Se
15. Mn
9. Zn
2
2
6
2
6
10
2
6
2
2
6
2
6
5
2
2
6
2
6
10
1s
2s
2p
3s
3p
3d
4s
4p
1s
2s
2p
3s
3p
3d
1s
2s
2p
3s
3p
3d
10
2
6
5
10
[Kr], [Ar] 3d
4s
4p
[Ar] 3d
[Ar] 3d
+3
+1
4. Al
-2
16. W
10. O
2
2
6
2
2
6
2
6
10
2
6
10
14
2
6
4
1
2
2
6
1s
2s
2p
1s
2s
2p
3s
3p
3d
4s
4p
4d
4f
5s
5p
5d
6s
1s
2s
2p
14
4
1
[Xe] 4f
5d
6s
+2
5. Fe
+4
11. Pt
+3
2
2
6
2
6
6
17. Mo
1s
2s
2p
3s
3p
3d
2
2
6
2
6
10
2
6
10
14
2
6
6
1s
2s
2p
3s
3p
3d
4s
4p
4d
4f
5s
5p
5d
6
2
2
6
2
6
10
2
6
3
[Ar] 3d
14
6
1s
2s
2p
3s
3p
3d
4s
4p
4d
[Xe] 4f
5d
3
[Kr] 4d
-3
6. As
+2
12. Zr
2
2
6
2
6
10
2
+2
1s
2s
2p
3s
3p
3d
4s
18. Pb
2
2
6
2
6
10
2
6
2
1s
2s
2p
3s
3p
3d
4s
4p
4d
2
10
2
2
6
2
6
10
2
6
10
14
2
6
10
2
[Ar] 4s
3d
2
1s
2s
2p
3s
3p
3d
4s
4p
4d
4f
5s
5p
5d
6s
[Kr] 4d
14
10
2
[Xe] 4f
5d
6s
Answer the following questions:
1.
Describe the two differences between a 2p
orbital and a 3p
orbital.
x
y
The 2px orbital lies on the x-axis. The 3py orbital lies on the y-axis and is larger than the 2px orbital.
2. The lobes of a p orbital disappear at the nucleus. What does this tell us about electrons in p orbitals?
The probability of finding an electron at the nucleus is 0 (you will never find an electron in the nucleus).
2
3
3. The electron configuration for phosphorus, written in core notation, is [Ne] 3s
3p
. What two things does Hund’s rule tell us
about the three electrons in the 3p sublevel?
The 3p electrons are in three different orbitals and have the same spin.
4. Use the periodic table to identify the neutral atoms having the following electron configurations:
Electron Configuration
Element
2
[Ne] 3s
magnesium
2
5
[Ar] 4s
3d
manganese
2
10
3
[Kr] 5s
4d
5p
antimony
–3
–2
–1
+1
+2
+3
5. Consider the following ions: N
, O
, F
, Na
, Mg
, and Al
.
a.
How many electrons are present in each ion? 10
2
2
6
b.
Write a single electron configuration representing all the ions. 1s
2s
2p
c.
Which neutral atom possesses this electron configuration? Neon
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