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

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Elements with atomic numbers 14, 15, 16

Elements with atomic numbers 20, 30, 50

Elements with atomic numbers 10, 18, 26

Elements with atomic numbers 30, 48, 80

answer is A.

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Detailed Solution

Element with atomic number 30 ; [Ar]3d¹⁰4s² has two electrons in outermost shell.

Element with atomic number 48; [Kr]4d¹⁰5s² has two electrons in outermost shell.

Element with atomic number 80; [Xe]4f¹⁴5d¹⁰6s² has two electrons in outermost shell.

Elements with atomic numbers 30,48, 80 have the same number (two) of electrons in the outermost shell.

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