Question

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the given atoms or ions. (i) F⁻ (ii) Ar (iii) Mg²⁺ (iv) Rb⁺

Answer 1

Explanation:

The species which have same number of electrons are known as isoelectric species

i)Na+

ii)K+

iii)Al3+

iv)Kr

Answer 2

Explanation:

Isoelectronic species are those which contains the same number of electrons.

(i)Isoelectronic of F⁻ is Ne as flourine contains only nine electron but the anion of flourine contains ten electron which is an isoelectronic of Neon as neon contains ten electrons.

(ii)Isoelectronic of Ar is Cl⁻ as chlorine contains only seventeen electron but the anion of chlorine contains eighteen electron which is an isoelectronic of Argon as argon contains eighteen electrons.

(iii)Isoelectronic of Mg²⁺ is Ne as Neon contains only ten electron. Magnesium contains twelve electron but after donating two electron only ten electron are left in magnesium cation.

(iv))Isoelectronic of Rb⁺ is Kr as krypton contains only thirty six electron. Rubidium contains thirty seven electron but after donating one electron only thirty six electron are left in Rubidium cation.