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Q.
Which of the following have the same number of electrons in outermost shell?
Classification of Elements and Periodicity in Properties
Solution:
Element with atomic number $30$ ; $[Ar] \,3d^{10} \,4s^2$
Element with atomic number $48$ ; $[Kr]\, 4d^{10}\, 5s^2$
Element with atomic number $80$ ; $[Xe]\, 4f^{14}\, 5d^{10}\, 6s^2$