Isoelectronic Species and Isomers of Butane

Let's explore two important concepts in Chemistry: Isoelectronic Species (from atomic structure) and the Isomers of Butane (from organic chemistry).

Question (Click to Flip)

What are isoelectronic species? Give an example.

Answer

Species (atoms or ions) that contain the same total number of electrons are called isoelectronic species. For example, Na+, Mg2+, and Ne all have exactly 10 electrons.

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Key Facts

Isoelectronic Species: Different elements/ions having the same number of electrons.

Butane Formula: C₄H₁₀.

Number of Butane Isomers: 2.

Names of Isomers: n-butane (straight chain) and isobutane (branched).

1. Isoelectronic Species

Definition: Atoms, ions, or molecules that have the exact same number of electrons are called isoelectronic species.
Why does it happen? Atoms can gain or lose electrons to form ions, and sometimes different elements end up with the same total electron count.
Example: Consider Neon (Ne). A neutral Neon atom has 10 electrons.
- Na⁺ (Sodium ion) = 11 - 1 = 10 electrons.
- Mg²⁺ (Magnesium ion) = 12 - 2 = 10 electrons.
- F⁻ (Fluoride ion) = 9 + 1 = 10 electrons. Therefore, Ne, Na⁺, Mg²⁺, and F⁻ are all isoelectronic species because they all have exactly 10 electrons.

2. Isomers of Butane

Definition of Isomers: Molecules that have the same chemical formula but different structural arrangements of atoms.
Butane Formula: C₄H₁₀.
Butane has exactly two structural isomers:
1. n-Butane (Normal Butane): All four carbon atoms are connected in a straight, unbranched chain. (C-C-C-C).
2. Isobutane (IUPAC name: 2-Methylpropane): The carbon atoms are branched. There is a continuous chain of 3 carbon atoms, with the 4th carbon attached to the middle carbon atom.

Questions and Answers

What are isoelectronic species? Give an example.+

Species (atoms or ions) that contain the same total number of electrons are called isoelectronic species. For example, Na+, Mg2+, and Ne all have exactly 10 electrons.

How many isomers does butane have? Name them.+

Butane (C4H10) has exactly two structural isomers. They are named n-butane (a straight chain) and isobutane (a branched chain, also called 2-methylpropane).

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