Which among the following species has the same number of electrons in its outermost as well as penultimate shell?

M g^{2 +}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

O^{2 -}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

F^{-}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C a^{2 +}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D $C a^{2 +}$
Penultimate shell is the shell just before the outermost shell.
In $M g^{+ 2}$ the electronic configuration is $2, 8$
In $O^{2 -}$ the electronic configuration is $2, 8$
In $F^{-}$ the electronic configuration is $2, 8$
In $C a^{+ 2}$ the electronic configuration is $2, 8, 8$
Hence, in calcium cation the number of electrons in the outermost shell is same as in penultimate Shell.

Suggest Corrections

Similar questions

Can u pls explain this rule 2 :The outermost shell cannot have more than 8 electrons. The penultimate shell cannot have more than 18 electrons. A new shell is formed as soon as the outermost shell attains 8 electrons

Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na⁺, K⁺, Mg²⁺, Ca²⁺, S^2–, Ar

Q. The outermost shell of a representative element contains

x

electrons and penultimate shell contains

y

electrons. The number of valence electrons could be:

If an atom has two electrons in its outermost shell. Which among the following can be the atomic number of that atom?

Which one of the following has the same number of electrons as $C a^{2 +}$ ?

Join BYJU'S Learning Program