Which neutral atom is isoelectronic?
a) N3-
b) Ba2+
Answer:
N3- Ne
Ba2+ Xe
isoelectronic means having the name number of electrons. a neutral N atom has 7 electrons, so an N3- ion has 3 more electrons, which gives 10 electrons. a neutral Neon atom has 10 electrons and thus is isoelectronic with N3-
Ba has 56 electrons, so Ba2+ has 2 fewer, or 54 electrons
Xe has 54 and thus is isoelectronic with Ba2+
Two ions are isoelectronic with each other when they have two shared characteristics:
1. The same number of valence electrons
2. The same number and geometry of atoms in the ion
The N atom has 5 valence electrons, so the N(3-) ion must have 8 valence electrons to give it a -3 charge. Likewise, the Ba atom has 2 valence electrons, so the Ba(2+) ion is missing these two electrons. This means the lower shell of electrons is now the valence shell, so it has 8 valence electrons.
So, we need an atom with 8 valence electrons in its normal, unionized state. Both Neon and Argon fit this description.
isoelectronic species are particles(atoms, ions or molecules) possessing the same no of ELECTRONS.
now, N3- has a total of 10 electrons. so it is isoelectronic with Ne(neon).
Ba2+ has 54 electrons. so it is isoelectronic with Xe(xenon).
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