Question

Select the correct answer.
Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have?
A.
0
B.
1
C.
9
D.
11

Answer 1

Answer:

B.1

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Answer 2

Potassium has only one ‘valence electron’.

Option: B

Explanation:  

• Sodium and potassium is in the same group of the ‘periodic table’. Sodium lies 11 in the ‘periodic table’.  

• That means the ‘first orbital’ contains 2 electron the second orbital contains 8 electron and the last orbital or the valence orbital contains only one electron.  

• Since sodium and potassium contains the same group the number of ‘valence electrons’ is same for the two elements. Hence potassium has ‘1 electron’ in the valence shell.

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