CHE-126 Study Guide - Quiz Guide: Nonmetal, Covalent Bond, Electronegativity
Document Summary
An atom is the smallest unit of matter. The nucleus is very dense and very tine. Electrons have negative charges (like a magnet) It is these charges that hold the atom together. Atomic number: all atoms of the same element contain the same number of protons. Each element had a unique atomic number. Neutral atoms contain the same number of electrons and protons. Know the difference between an element and a compound. Electrons are given, taken away, or shared. Chemical reactions involve compounds the combination of atoms. Elements contain only one type of atom: neon, gold, fluorine. Compounds contain more than one type of atom in simple fixed ratios: carbon dioxide, water. Know how to tell him whether or not an equation is balanced and know how to balance it. Chemical equations are ways to describe what happens in a chemical reaction. Arrows show the direct: reactants -> products. The number of atoms remains the same.
