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Observe the model of periodic table.

a. Which element is having S electrons in valence shell? 

b. Which elements are having 2 electrons in valence sub-shell? 

c. Which element is having last electron in 3p? 

d. Which element ends with electronic configuration 4d5 , 5s1 ?

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a. B; 

b. A, C;

c. C, D; 

d. E

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