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Get Answers to all your Questions
- #Amrita Engineering Entrance Examination
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- #Classification of elements and periodicity in properties
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- #Chemistry
The element with atomic number 25 belongs to which group?
Option: 1
Group 7
Option: 2
Group 4
Option: 3
Group 13
Option: 4
Group 9
Answers (1)
The electronic configuration of the elements is
1s22s22p63s23p64s23d5
Since the last electron is entering the d- subshell, the element belongs to the d block.
The highest principle quantum number in which the electron is present is 4, hence the period of the element is 4.
Since the element belongs to the d block, the group number is equal to the sum of the number of electrons in (n-1)d and ns orbitals which is 5 + 2 = 7.
Hence, Opt(A) is correct.
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