CHE 102 Study Guide - Falla Monument, Umber, Aneityum
Document Summary
Mixture: a physical combination of two or more substances that may be present invariable amounts. Atmosphere: nitrogen (78%), an inert gas, oxygen (21%), a highly reactive gas, other gases (<1%) include argon and carbon dioxide. Element: a pure substance that cannot be broken down into simpler substances by chemical means. Constant composition: the relative amounts of the elements contained in a compound is fixed. Isotopes differ in the number of neutrons in the nucleus. Atomic number will give you number of protons and electrons. Subtracting the mass number from the atomic number will give the number of neutrons. A covalent bond is formed when two atoms share their electrons to complete their outer shell. An elements chemical behavior is determined mostly by the number and arrangement of electrons in the outer shell. A neutron is a subatomic particle with a neutral charge and a mass of 1 amu.
