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in Periodic Table and Electronic Configuration by (35.5k points)
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The electronic configuration of the elements A, B, C, Dare given below. 

A – 1s2 2s2 2p6 3s2 3p4

B – 1s2 2s2 2p6 3s2

C – 1s2 2s2 2p6 3s2 3p5 

D – 1s2 2s2 2p6 3s1 

a. Which of these elements show +2 oxidation state? 

b. Which metal belongs to 17th group? 

c. Which is the period number of the element A ? What is the basis of your findings? 

d. Which of these elements can form basic Oxides?

1 Answer

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by (37.7k points)
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Best answer

a. B

b. C 

c. Period number: 3, Period number = No.of shells 

d. B, D

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