BIOLOGY 1113 Lecture Notes - Lecture 3: Electron Shell, Radionuclide, Solution

• School: Ohio State University
• Department: Biology
• Course: BIOLOGY 1113
• Professor: Eric Danhart

Document Summary

Chapter 2: water and carbon: the chemical basis of life. Theory of chemical evolution- theory that simple chemical compounds in early atmosphere combined w/ chemical reactions forming larger substances, leading to origin of life. 2. 1: atoms, ions, and molecules: the building blocks of chemical evolution. H, c, n, o make up 96% of all organisms. Element- substance consisting of atoms w/ specific # protons(preserve identity in chemical reactions. Atomic #- # of protons in nucleus of atom of element. Isotopes- element with different number of neutrons. Atomic weight- avg. mass of an element that is based on relative proportions of all naturally occurring isotopes. Radioactive isotope- atom with unstable nucleus, releasing radiation and decays to stable form(becomes different element by losing protons). Orbitals- region of space around atomic nucleus in which electron is present(grouped into electron shells). Valence shell- outermost electron shell(tend to be involved in bonding).