A Lewis structure, also known as a Lewis dot structure, is a diagram that depicts the bonding between atoms in a molecule and the lone pairs of electrons that may exist. It was developed by the American chemist Gilbert N. Lewis in 1916. In a Lewis structure: 1. **Atoms** are represented by their chemical symbols (e.g., H for hydrogen, O for oxygen, C for carbon). 2. **Valence electrons** are represented as dots around the atomic symbols.
Steven Chu is an American physicist and Nobel laureate known for his work in the fields of physics and energy. He was born on February 28, 1948. Chu is particularly renowned for his research in laser cooling and trapping of atoms, for which he received the Nobel Prize in Physics in 1997, shared with Claude Cohen-Tannoudji and William D. Phillips.