1.Define a chemical element. 2.Describe the structure of an atom.
Copyright © 2015 Wolters Kluwer • All Rights ReservedElements (cont.)Atomic Structure•Nucleus–At atom’s center–Composed of•Protons; positively charged•Neutrons; not charged•Electrons–Negatively charged–Orbit in energy levels around the nucleus–Determine atom’s chemical reactivity
Copyright © 2015 Wolters Kluwer • All Rights ReservedFigure 2-2 The oxygen atom.How does the proton number of this atom compare with the electron number?Elements (cont.)
Copyright © 2015 Wolters Kluwer • All Rights ReservedElements (cont.)Atomic Number•Equal to the number of protons in an atom’s nucleus.•Also represents the number of electrons orbiting the nucleus.•No two elements share the same atomic number.8OxygenO16.00Oxygen’s nucleus contains eight protons. Its atomic number is 8.
Copyright © 2015 Wolters Kluwer • All Rights Reserved Elements (cont.) Energy Levels • Regions around an atom’s nucleus where electrons orbit.
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