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Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.3Li, 14Si, 2He, 11Na, 15PWhich of these elements belong to be period 3? |
Answer» Electronic configuration:⇒ The atomic NUMBER of LITHIUM = 3The electronic configuration of 3Li = 2,1⇒ The atomic number of silicon = 14The electronic configuration of 14Si = 2,8,4⇒ The atomic number of helium = 2The electronic configuration of 2He = 2⇒ The atomic number of sodium = 11The electronic configuration of 11Na = 2,8,2⇒ The atomic number of phosphorus = 15The electronic configuration of 15P = 2,8,5Among the given ELEMENTS, Na(2,8,2), Si(2,8,4) and P(2,8,5) belong to GROUP 3. Because in these elements, total three shells are present. Thus, these elements belong to group 3.. |
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