Covalent bonding is a common type of bonding, in which two or more atoms share up to three valence electrons. In nonpolar covalent bonds, the electronegativity difference between the bonded atoms is small, typically 0 to 0.3. Bonds within most organic compounds are described as covalent.
The Silent Generation refers to people who were born between 1925 and 1945. There are several theories as to where the label 'Silent Generation' originated. The children who grew up during this time worked very hard and kept quiet. It was commonly understood that children should be seen and not heard.
In fact, Generation X, the name for those born between 1965 and 1980, did not exist while Howe and Strauss were writing Generations. They were originally called the baby busters because birth rates decreased after the previous generation, the baby boomers.