Question

Which of the following species are isoelectronic ?Al3+, F, Cl- , O2- , Na , Mg2+

Answer 1

Answer:

hloo...

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N³⁻ ( 10 electrons ) , O²⁻ (10 electrons ),

F⁻ ( 10 electrons ), Na⁺ (10 electrons ),

Mg²⁺(10 electrons) , Al³⁺(10electrons)

we can see that all the given species have same number of electrons ( 10 electrons )

so, all are isoelectronic species .

(b) we know, The ionic radii of isoelectronic species decreases with increase in atomic number because magnitude of nuclear charge increases with increase atomic number .

increasing order of radii ,

Al³⁺(Z = 13) < Mg²⁺( Z = 12 ) < Na⁺ ( Z = 11) < F⁻ (Z = 9) < O²⁻(Z = 8) < N³⁻ (Z = 7)..

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Answer 2

Explanation:

Al3+ has 10 electrons ,F has 9 electrons,Cl- has18 electrons,O2- has 10 electrons,Na has 11 electrons,Mg2+ has 10 electrons.the species which have same number of electrons are called iso electronic species.so Al3+, O2- MG 2 +are isoelectronic species