Modules 5 Chemical Formulas, Structural Formulas and Models of Ionic Compounds ACTIVITY 5.1: Give the symbol of the: 1. ion with 34 protons and 36 electrons. 2. ion with 17 protons and 18 electrons. 3. polyatomic ion made up of carbon and oxygen with a charge of 2-. 4. polyatomic ion with a+1 charge. 5. two ions of tin. ACTIVITY 5.2: Write the correct chemical formulas of these ionic compounds. 1. Strontium and phosphate 2. Al3+ and sulfur2- 3. Cu2+ and O2- 4. Potassium and permanganate 5. Tin (II) and fluorine

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Q: b. 2Fe(s) + 3S(s) → Fe2S3

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Q: Why is agron the smallest than the other elements in period 3?

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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.