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(a) Write the electronic configuration...

(a) Write the electronic configurations of the elements given below:
A (At. No=9), B(At. N=12) , C (At. No=29), D(At.No=54) , and E(At. No=58).`
(b) Also predict the period group number and block to which they belong.
( C) Classify them as representative elements , noble gases, transition and inner transition elements.

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### Step-by-Step Solution: #### (a) Write the electronic configurations of the elements: 1. **Element A (Atomic Number = 9)** - The atomic number indicates the number of electrons. For element A, which is Fluorine (F), the electronic configuration is: - **Configuration**: 1s² 2s² 2p⁵ ...
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