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Electrons and Ions (p. 37) (Date). Target: I know what an ion is and how to find the number of electrons. Number of electrons is usually the same as the number of protons, unless the atom has a charge Charged atoms are called ions

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electrons and ions p 37 date

Electrons and Ions (p. 37)(Date)

Target: I know what an ion is and how to find the number of electrons.

slide2

Number of electrons is usually the same as the number of protons, unless the atom has a charge

  • Charged atoms are called ions
  • Atoms charge negative by gaining electrons, or they charge positive by losing electrons
electron arrangement in an atom 74 half page
Electron Arrangement in an Atom(74, half page)
  • (Copy Figure 2 on p. 227 with txt a, b, c)
slide5

Electrons are found in electron shells or energy levels, according to the period number

  • Atoms can only gain or lose electrons from the outermost shell
  • Electrons in the outermost shell are called valence electrons
summary p 75
Summary( p. 75):
  • (Write a 3 sentence summary, using the words “atomic number”, “electrons”, “ion”)
practice list the number of protons neutrons and electrons p 56
Practice: List the number of protons, neutrons and electrons (p. 56)
  • Fluorine- 19, atomic number 9: P __, N__, E__
  • Lithium-7, atomic number 3 : P __, N__, E__

Use your periodic table:

  • Helium-4 : P __, N__, E__
  • Calcium-41 : P __, N__, E__
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