Question

1. Write down the electronic
configuration of the following
elements from the given atomic
numbers. Answer the following
question with explanation.
a. Li, Si, He, Na, SP Which of these
elements belong to be period 3?
11​

Answer 1

Answer:

Li=2,1

Si=2,8,4

He=2

Na=2,8,1

Answer 2

Explanation:

1. Li:- 1s² 2s¹
2. Si:- 1s² 2s² 2p⁶ 3s² 3p²
3. He:- 1s²
4. Na:- 1s² 2s² 2p⁶ 3s¹
5. Si, Na are period 3

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