Unit I: Some Basic Concepts of Chemistry (18 Periods) ... Unit IV: Chemical Bonding and Molecular Structure (20 Periods) Valence electrons, ionic bond, covalent bond, ...

CBSE Class 11 Chemistry Syllabus for 2024-25. Unit I: Some Basic Concepts of Chemistry . General Introduction: Importance and scope of Chemistry. Nature of matter, laws of chemical combination ...

In Image and Reality, Rocke covers Kekulé's work, varied life and personality, and locates the chemist's thinking in the context of developing ideas about chemical bonding and molecular structure ...

The determination in 1953 of the structure of deoxyribonucleic acid (DNA), with its two entwined helices and paired organic bases, was a tour de force in X-ray crystallography. But more ...