3
Question
All of the following elements have the valence electron(s) in their M shell, except
All of the following elements have the valence electron(s) in their M shell, except
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Solution
The correct option is C Potassium
Element with symbol
Atomic number
Electronic configuration
K
L
M
N
Aluminium (Al)
13
2
8
3
Sodium (Na)
11
2
8
1
Potassium (K)
19
2
8
8
1
Magnesium (Mg)
12
2
8
2
Potassium (K) has its valence electron in the N shell.
Hence, the correct answer is option (c).
|
Element with symbol |
Atomic number |
Electronic configuration |
|||
|
K |
L |
M |
N |
||
|
Aluminium (Al) |
13 |
2 |
8 |
3 |
|
|
Sodium (Na) |
11 |
2 |
8 |
1 |
|
|
Potassium (K) |
19 |
2 |
8 |
8 |
1 |
|
Magnesium (Mg) |
12 |
2 |
8 |
2 |
Potassium (K) has its valence electron in the N shell.
Hence, the correct answer is option (c).
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