Which one of the following groupings represents a collection of isoelectronic species? (At. numbers: Cs -55, Br-35)

Question

Which one of the following groupings represents a collection of isoelectronic species? (At. numbers: Cs -55, Br-35) (A) Na +, Ca 2+, Mg 2+ (B) N 3-, F -, Na + (C) Be , Al 3+, Cl - (D) Ca 2+, Cs +, Br

Tardigrade Admin · Accepted Answer

N 3- 7+3=10 electrons F - 9+1=10 electrons Na + 11-1=10 electrons

Q. Which one of the following groupings represents a collection of isoelectronic species? (At. numbers : $C s - 55, B r - 35)$

$N a^{+}, C a^{2 +}, M g^{2 +}$

$N^{3 -}, F^{-}, N a^{+}$

$B e, A l^{3 +}, C l^{-}$

$C a^{2 +}, C s^{+}, B r$

$N^{3 -} 7 + 3 = 10$ electrons

$F^{-} 9 + 1 = 10$ electrons

$N a^{+} 11 - 1 = 10$ electrons

Q. Which one of the following groupings represents a collection of isoelectronic species? (At. numbers : Cs−55,Br−35)

Na+,Ca2+,Mg2+

N3−,F−,Na+

Be,Al3+,Cl−

Ca2+,Cs+,Br