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Q.

The atomic number of sodium is 11 and valence shell for sodium is 3. Identify the period number for sodium.

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a

1st

b

2nd

c

3rd

d

4th

answer is C.

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Detailed Solution

Last electron enter into 3rd shell of s-subshell. So, it is belongs to 3rd period.

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The atomic number of sodium is 11 and valence shell for sodium is 3. Identify the period number for sodium.