APHY 101 Lecture Notes - Lecture 2: Ribose, Glycerol, Acidosis
Document Summary
Elements: simplest types of matter with certain chemical properties. Atoms: smallest particles of an element that have properties of that element. Major elements symbol approximate percentage of the human body. Atomic number: number of protons in the nucleus of an atom of a specific element, each element has a unique atomic number. Mass number: the number of protons plus the number of neutrons in one atom, electrons do not contribute to the mass of the atom because they are so light. All atoms of a certain element have the same atomic number. Isotopes are atoms with the same atomic numbers but with different mass numbers. Isotopes contain different numbers of neutrons, but same number of protons & electrons. Oxygen often forms isotopes with numbers representing mass numbers). Radioactive isotopes are unstable, releasing energy or atomic fragments (atomic radiation) until they gain stability; some are used to detect and treat disease.
