Which of the following have the same number of electrons in outermost shell?

Question

Which of the following have the same number of electrons in outermost shell? (A) Elements with atomic numbers 30, 48, 80 (B) Elements with atomic numbers 14, 15, 16 (C) Elements with atomic numbers 20, 30, 50 (D) Elements with atomic numbers 10, 18, 26

Tardigrade Admin · Accepted Answer

Element with atomic number 30 ; [Ar] 3d10 4s2 Element with atomic number 48 ; [Kr] 4d10 5s2 Element with atomic number 80 ; [Xe] 4f14 5d10 6s2

Q. Which of the following have the same number of electrons in outermost shell?

Elements with atomic numbers 30, 48, 80

Elements with atomic numbers 14, 15, 16

Elements with atomic numbers 20, 30, 50

Elements with atomic numbers 10, 18, 26

Element with atomic number $30$ ; $[A r] 3 d^{10} 4 s^{2}$
Element with atomic number $48$ ; $[Kr] 4 d^{10} 5 s^{2}$
Element with atomic number $80$ ; $[X e] 4 f^{14} 5 d^{10} 6 s^{2}$

Q. Which of the following have the same number of electrons in outermost shell?

Elements with atomic numbers 30, 48, 80

Elements with atomic numbers 14, 15, 16

Elements with atomic numbers 20, 30, 50

Elements with atomic numbers 10, 18, 26

Element with atomic number 30 ; [Ar]3d104s2 Element with atomic number 48 ; [Kr]4d105s2 Element with atomic number 80 ; [Xe]4f145d106s2

Element with atomic number $30$ ; $[A r] 3 d^{10} 4 s^{2}$
Element with atomic number $48$ ; $[Kr] 4 d^{10} 5 s^{2}$
Element with atomic number $80$ ; $[X e] 4 f^{14} 5 d^{10} 6 s^{2}$