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Q.

z*for a 1s electron in Fe atom is :

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a

25.65

b

3. 76

c

25.70

d

2.85

answer is B.

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Detailed Solution

The atomic number of Fe is 26,  so its nuclear charge is equal to the number 26.
For 1s of the electron, this value reduces by 0.3 and becomes 25.70.

Hence, the correct option is B.

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