Rows on the periodic table, they are read left to right. The period will show you how many shells each row of elements have. Ex. Period 2 has 2 shells, Period
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What is a group?
These are called families too. This is the column. This will explain how many valence electrons there are, example group 1 has 1 valence electron.
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List five clues that indicate that there was a chemical reaction.
1) Change in color 2) Release of energy 3) Formation of a gas 4) Precipitate 5) Odor
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What is the difference between endothermic and exothermic reactions?