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THE ATOM

THE ATOM. In the nucleus: Protons -positive charge Neutrons – no charge Mass about equal. About 1870 x mass of an electron. . Outside the nucleus: Electrons Negative charge . WHAT ARE THOSE NUMBERS?. Atomic mass is relative mass value of protons and neutrons.

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THE ATOM

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  1. THE ATOM

  2. In the nucleus: • Protons -positive charge • Neutrons – no charge • Mass about equal. • About 1870 x mass of an electron. Outside the nucleus: • Electrons • Negative charge

  3. WHAT ARE THOSE NUMBERS? • Atomic mass is relative mass value of protons and neutrons. • Atomic number is the number of protons in the nucleus. It identifies the element. Protons do not move. • Mass number is sum of the protons and neutrons in nucleus. • In a neutral atom, the number of protons is equal to the number of electrons.

  4. Ions have gained or lost electrons. • Charge = number of protons – number of electrons • Cation is a positively charged particle. • Anion is negatively charged particle.

  5. Isotope are elements that have the same number of protons but a different number of neutrons. This means that the mass number is different for each isotope. • Chemical and physical properties are similar. • Some are manmade. • Some are radioactive.

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