SD SCIENCE 9 - LEWIS DOT SYSTEM

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Created by
Alex Sunico

Cards (11)

  • The Lewis dot structure shows the distribution of valence electrons around atoms.
  • Ionic bonds occur between metals and nonmetals, where metal atoms lose electrons to become positively charged ions (cations) and nonmetal atoms gain electrons to become negatively charged ions (anions).
  • A covalent bond occurs when two atoms share one or more pairs of valence electrons to form a chemical compound.
  • Atoms may gain, lose or share valence electrons to reach a stable configuration.
  • In the Lewis dot structure, electrons are represented as dots around the nucleus of an element.
  • The Lewis dot structure is the most basic representation of an atom or molecule, showing how many electrons are present.
  • Step 1: Find the total number of Valence Electrons.
    Ex: H2O 1(2)+6 = 8
  • Step 2: Put the least electronegative atom in the center.
    Important NOTE: HYDROGEN (H) always goes on the outside.
    Ex: NO2 : O - N - O
  • Step 3: Put 2 electrons between elements to form a bond.
    Ex: H : Cl
  • Step 4: Complete octets on outside atoms.
  • Step 5: If central atoms does not have an octet, move electrons from outer atoms to form double or triple bonds.
    Important note: The Metals will always give their electrons to Non Metals.