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Formation of Ionic Compounds

Formation of Ionic Compounds. compound - a combination of different element - can be ionic or covalent. compounds. covalent. ionic. Valence shell In an atom the outermost shell of electrons, the valence shell, determines its interaction with other atoms. Octet rule

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Formation of Ionic Compounds

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  1. Formation of Ionic Compounds

  2. compound - a combination of different element - can be ionic or covalent compounds covalent ionic

  3. Valence shell • In an atom the outermost shell of electrons, the valence shell, determines its interaction with other atoms

  4. Octet rule • all atoms strive to have the same valence shell as their closest noble gas

  5. Lewis symbols • Since how atoms react is dictated by the number of electrons in their valence shell Lewis symbols can be used to draw valence shells, ex. Na

  6. first place electrons, one at a time, at the 12, 3, 6, and 9 o’clock positions, add more electrons by pairing them, one at a time, in the same order as you placed the first four electrons

  7. Formation of Ions • atoms are most stable when their valence shell is full, like that of Noble Gases • they achieve this by gaining or losing electrons, depending on how many they have  if they have less than 4 e they will lose them  if they have more than 4 e they will gain them

  8. http://jchemed.chem.wisc.edu/JCEsoft/CCA/CCA0/movies/NACL1.htmlhttp://jchemed.chem.wisc.edu/JCEsoft/CCA/CCA0/movies/NACL1.html

  9. ions • atoms that lose or gain an electron are called ions • ions can also be represented by Lewis symbols: the Lewis symbol is enclosed in square brackets, the charge of the ion is placed outside the brackets.

  10. cations • positively charged ions, have lost electrons, ex. Na, • metals lose electrons and become cations sodium atomsodium ion

  11. anions • negatively charged ions, have gained electrons, ex. Cl • nonmetals gain electrons and become anions chlorine atomchloride ion

  12. Ionic bonds form between metals and nonmetals. • since opposites attract, when a cation and anion come into contact, they experience an electrostatic force of attraction, resulting in a chemical bond known as an ionic bond

  13. ionic compounds ex. NaCl -crystals (or crystal salts) of positive and negative ions held together by electrostatic forces (ionic bonds) -they form formula units (not molecules)

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