3 .Identify unknown metals ions based on the results of the flame tests. PROBLEM QUESTION: What is the identity of the unknown ion? Lithium (Li) HYPOTHESIS: Choose from the following list of metallic ions and answer the above question in a complete sentence that incorporates the question: barium (Ba), strontium (Sr), lithium (Li), sodium (Na"), calcium (Ca"), copper (II) (Cu), or potassium (K).

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.