Bonding test questions Why do atoms bond together? To become more stable What is the valence shell? The outer energy shell of an atom. What is the octet rule? Atoms want to 8 electrons in their valence shell. What type of bond occurs between a metal and a non-metal? Ionic bond What type of bond occurs between two non-metals? Covalent bond Polar and non-polar are types of what kind of bond? Covalent bond What 2 pieces of information does a chemical formula give us? Chemical (Element) symbol and subscript What do you call the little number to the right of an Element symbol in a chemical formula? Subscript In an ionic compound the positively charged ion is always on which side of the chemical formula? Left What type of bonding shares electrons? Covalent Reactant- the substances present before a chemical reaction occurs Product- the substances that are formed during a chemical reaction Chemical reaction- a process that changes substances into new substances Synthesis reaction – two or more elements or compounds combine to form a more complex compound Decomposition reaction – the breakdown of substances into 2 or more substances (the opposite of a synthesis reaction.