Definition

1. Noun (Chemistry):
   • Mesomer: A state or concept in chemistry describing a molecule that cannot be accurately represented by a single structural formula but is instead a hybrid of several possible structures. These structures differ only in the distribution of electrons, not in the positions of atoms.
   • Resonance hybrid: A molecule for which two or more valid Lewis structures (resonance forms) can be drawn to represent its bonding. The actual molecule is an average of these forms.

Usage Examples

• Noun:
  • Benzene là một ví dụ điển hình của hiện tượng trung phân. (Benzene is a classic example of mesomerism.)
  • Cấu trúc trung phân giúp giải thích tính ổn định của phân tử. (The resonance hybrid structure helps explain the stability of the molecule.)

Advanced Usage

• "Hiện tượng trung phân": The phenomenon of resonance or mesomerism in chemistry.
  • Hiện tượng trung phân rất quan trọng trong hóa học hữu cơ. (The phenomenon of resonance is very important in organic chemistry.)

Variants and Related Words

• Cộng hưởng (n): Resonance. This is a more common synonym in modern Vietnamese chemistry terminology.

  • Cấu trúc cộng hưởng (Resonance structure)

• Dạng trung gian (n): Intermediate form (can be used in a broader chemical context).

Synonyms

• Resonance hybrid
• Mesomeric structure
• Resonance structure (refers to the individual contributing forms, not the hybrid itself)

Notes on Usage

• "Trung phân" is a specialized scientific term. In contemporary Vietnamese, "cộng hưởng" is more frequently used to describe the same chemical concept.
• The term is primarily used as a noun and is not commonly used in everyday language outside of chemistry.