of electrons inside their atoms. 4.9 Ionic
Fluorine has 9 electrons (1s2 2s2 2p5), so the fluoride ion has 10 electrons and the same electron configuration as the oxide ion. Isoelectronicity leads to the concept of hydrogen-like atoms, ions with one electron which are thus isoelectronic with hydrogen. Thus it has the least "pull" on the electrons and this species is the largest. [2] More usually, alternatives are broader, and may extend to allowing different numbers of atoms in the species being compared. (ii) Ar has 18 electrons. The N atom and the O radical ion are isoelectronic because each has five electrons in the outer electronic shell.
Thus, the species isoelectronic with it will also have 10 electrons.
A typical question about isoelectronic …
4.6 Ions
Na⁺ , number of e⁻ = 11 - 1 = 10 e⁻ Mg²⁺, number of e⁻ = 12 - 2 = 10e⁻ K⁺, number of e⁻ = 19 - 1 = 18 e⁻ Ca²⁺, number of e⁻= 20 -2 = 18 e⁻ S²⁻, number of e⁻ = 16 +2 = 18e⁻ Ar , … F-.
isoelectronic. Ca2+ < K+ < Ar Ar, K+ and Ca2+ are isoelectronic i.e with the same number of electrons, 18. Na+ has a smaller ionic radius than
Isoelectronic are the species having same number of electrons. Therefore, the ionic size: Ca+2 < K+ <
Size
Isoelectronicity does not relate to formal charge on the atoms in a structure: these all have the same configuration even though carbon monoxide has formal charges that are balanced (−:C≡O:+) whereas dinitrogen has each atom neutral (:N≡N:) and nitrosonium has an overall net charge. Some of its isoelectronic species are Na+ ion (11 – 1 = 10 electrons), Ne (10 electrons), O2– ion (8 + 2 = 10 electrons), and Al3+ ion (13 – 3 = 10 electrons). Rule
Which of the following pairs of ions are isoelectronic and isostructural? Isoelectronic species can be expected to show useful consistency and predictability in their properties. Concept : Isoelectronic species have the same number of electrons but different atomic numbers Note :- Number of positive charges show, number of electrons lost and number of negative charges show , number of electrons gained by atom . For a moment I thought I heard a zoology term that I had no idea about..! Similarly, same number of valence electrons, same structure and same number of atoms the cations K , Ca , and Sc and the anions Cl , S , and P are all isoelectronic with the Ar atom.
There are many ions that are
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It is formed by overlapping of valence shell atomic orbital of the two atoms having unpaired electron.
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