Online worksheet ยท 4 of 4
An atom is a unit of an element - Online practice 4
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Model sample contains only carbon dioxide molecules, formula CO2. A number after a symbol counts that atom; no number means one. H = hydrogen, O = oxygen, N = nitrogen, C = carbon, S = sulfur. An element has one atom type; a compound has different types chemically bonded. This is paper notation, not a request to obtain or handle the substance.
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