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Periodic table 4 - PowerPoint PPT Presentation


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Periodic table 4. Ions P 115. Ions have a Charge. Ion – an atom or group of atoms that have gained or lost electrons and has a negative or positive charge. Sodium (Na) Loses One Electron. Sodium has 1 valence electron. It gives up that electron to form an ion. That ion has a +1 charge.

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Presentation Transcript
ions have a charge
Ions have a Charge
  • Ion – an atom or group of atoms that have gained or lost electrons and has a negative or positive charge
sodium na loses one electron
Sodium (Na) Loses One Electron
  • Sodium has 1 valence electron.
    • It gives up that electron to form an ion.
    • That ion has a +1 charge.
  • Why is the charge +1?
valence and ions
Valence and Ions
  • Atoms “like” to have 8 electrons in their outer shell. It helps make them stable.
  • Atoms “give up” or “take” the fewest electrons to get them to 8 electrons in their outer shell when forming ions.
fluorine f gains one electron
Fluorine(F) Gains One Electron
  • Fluorine has a valence of 7.
  • To get 8 in its outer shell, it picks up or takes an extra electron to make fluoride.
  • Fluoride has a charge of -1
  • Why does it pick up an electron?
  • Why is the charge -1?
cations and anions
Cations and Anions
  • Cation – an ion with a positive charge
  • Anion – an ion with a negative charge
what ion would calcium ca form
What Ion would Calcium (Ca) form?
  • What is calcium’s valence?
  • What Ion would it form?
what ion would iodine i form
What Ion would Iodine(I) Form?
  • What is Iodine’s valence?
  • What Ion would Iodine form?