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The electronic configuration of some ele...

The electronic configuration of some elements are given. (Symbols are not real). Analyse them and answer the following questions.
B=2,8,7
C=2,8,1
D= 2,8,3
a) Which of the following show the valency '1'?
b) To which group does the elements 'D' belong? c) Which element among these has the lowest ionisation energy? Why?

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a) A and C
b) 13
c) C. this element is electropositive. Hence it donates electrons and attain stability.
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