BSCI 105 Lecture Notes - Lecture 1: Hydrogen Bond, Nitrogen Dioxide, Electronegativity

• School: University of Maryland
• Department: Biological Sciences Program
• Course: BSCI 105
• Professor: Patricia Shields

Document Summary

96% consists of: hydrogen (h, carbon(c, oxygen (o, nitrogen (n) Atomic number: number of protons in the nucleus: weight (p) = 0. 00000000000000000000000167g, 1. 67 x 10-24 g, 1 amu or 1 dalton. Atomic weight: ~ equal to the sum of protons and neutrons in nucleus. Remember isotopes: same # of protons, different # of neutrons. Atomic interactions atomic nuclei never" interact atomic interactions are between electrons electrons have variable amounts of energy: electrons closer to the nucleus have lower amounts" of energy, electrons in the outer shell determine the reactivity" of the atom. In a normal atom, # electrons = # protons. The behavior and distribution of electrons in atoms is the basis for chemistry shells o o. Specifically, by the electrons in the outer shell, or valence electrons. A compound is made up of two or more interacting atoms: valence electrons form bonds.