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The top documents tagged [nonmetalsnoble gases]
Types of Elements 1.Metals 2.Non-Metals 3.Metalloids
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Chapter 9 Electrons in Atoms and the Periodic Table 2006, Prentice Hall Helium gas He has 2 protons and if neutral how many electrons?
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Periodic Table – Elements Elements are pure substances made up of atoms that cannot be broken down. These Elements are categorized by characteristics as:
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