Question

The species isoelectronic with C₂H₄ is
(a) O₂⁺ (b) CN⁻
(c) N₂⁺ (d) O₂

Answer 1

The species isoelectronic with C₂H₄ is O₂.

• Option (d) is correct.
• Isoelectronic refers to molecules, ions or atoms that have the same count of valence electrons and the same electronic structure.
• Now,
• The atomic number of O₂ = 8
• The atomic number of C = 6
• The atomic number of H = 1
• The atomic number of N = 7
• We are given with,  
• C2H4  = 2×6 + 4×1 = 16 electrons
• O₂⁺ = 2×8-1 = 15 electrons
• CN⁻ = 1×6 + 1×7 +1 = 14 electrons
• N₂⁺ = 2×7 -1 = 13 electrons
• O₂  = 2×8 = 16 electrons
• As we can see that, C2H4 and O₂  have same number of electrons, hence they are isoelectronic.

Answer 2

O2 is isoelectric with C2H4.

Explanation:

• Isoelectric species are defined as the species with the same number of electrons.

• So the total number of the electrons of each species should be calculated and tallied with that of ethene.

• First, atomic number of each element is noted.

• Atomic number or carbon = 6.

• Atomic number of hydrogen = 1.

• Atomic number of Oxygen = 8.

• Atomic number of nitrogen = 7.

• So, in ethene, number of electrons = $2\times6 + 1\times 4$

• = 16 electrons.

• In O₂⁺, the number of electrons = $2\times8 - 1$ = 15 electrons.

• In CN⁻, the number of electrons = $6 +7+1$ = 14 electrons.

• In N₂⁺, the number of electrons = $2\times7 - 1$=13 electrons.

• In O₂, the number of electrons = $2\times8$ =16 electrons.

• So oxygen gas has equal number of electrons as ethene.

• So its isoelectronic with ethene.

For more information about isoelectronic species,

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What do you understand by isoelectronic species? Name the species that will be iso-electronic with each of the following atoms or ions.

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