Atoms elements
Atoms and Elements. Chlorine Cl 2 Hydrogen chlorideHCl Methane CH 4 Carbon dioxide CO 2 Draw a line between the molecule and its name.
How many valence electrons are in an atom of magnesium? 1.2 2.3 3.4 4.5.
1 Chapter 4Atoms and Elements 4.5 Isotopes and Atomic Mass Basic Chemistry Copyright © 2011 Pearson Education, Inc.
Chapter 7.3. How do we use these? These indicate which of the elements make up a substance. These also indicate the number of ions or atoms that.
18 Oct. 2010
Before we can balance equations, we need to be able to count the atoms in a compound or molecule. Example: O 2 There are 2 atoms of oxygen in this molecule.
Atoms
Ionic Compounds
