সমযোজী বন্ধন কথাটির প্রচলন সর্বপ্রথম কত সাল থেকে শুরু হয়েছিল ?
Covalent bonding includes many kinds of interactions, including σ-bonding, π-bonding, metal-to-metal bonding, agostic interactions, bent bonds, and three-center two-electron bonds. The term "covalent bond" dates from 1939. The prefix "co-" means "jointly, associated in action, partnered to a lesser degree, " etc.; thus a "co-valent bond", in essence, means that the atoms share "valence", such as is discussed in valence bond theory.
1939