Share. By Anne Marie Helmenstine, Ph.D. Definition: Valence bond theory is a chemical bonding theory that explains the bonding between two atoms is caused by the overlap of half-filled atomic orbitals. The two atoms share each other's unpaired electron to form a filled orbital to form a hybrid orbital and bond together.
The Second Continental Congress was a convention of delegates from the Thirteen Colonies that started meeting in the summer of 1775, in Philadelphia, Pennsylvania, soon after warfare in the American Revolutionary War had begun.
Wikimedia Commons. John Adams, second president of the United States. John Adams, our second president (1797-1801), was a Harvard-educated lawyer, a two-term vice president and a very quotable man. Some scholars think of him as equal parts philosopher and politician.