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Ionic Formulas

Ionic Formulas. Turning chemistry into algebra. REVIEW. We can tell how many electrons an atom will gain or lose by looking at its valence electrons. Metals like to lose electrons. ( Cations ) Ex. Na + Nonmetals like to gain electrons. (Anions) Ex: O 2-

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Ionic Formulas

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  1. Ionic Formulas Turning chemistry into algebra

  2. REVIEW • We can tell how many electrons an atom will gain or lose by looking at its valence electrons. • Metals like to lose electrons. (Cations) • Ex. Na + • Nonmetals like to gain electrons. (Anions) • Ex: O 2- • All elements try to have a full valence of 8 electrons(OCTET RULE).

  3. REVIEW • Cation- is a positively charged ion. • How do cations form? • When atoms LOSE electrons they become positive. • Anion- is a negatively charged ion. • How do anions form? • When atoms GAIN electrons they become negative.

  4. Na Cl Chemical Bonding A chemical bond is the force of attraction that holds two atoms together. Attractive Force

  5. Why do elements form chemical bonds? Atoms form chemical bonds in order to fill their outermost energy level with electrons. A full valence causes an atom to be more stable. A full valence consists of 8 valence electrons.

  6. Ionic Bonding Ionic bonds: Metal atoms transfer electrons to nonmetal atoms. Producing oppositely charged ions (cation & anion) which attract each other. Na+ + Cl- NaCl

  7. Write an ionic formula for Na+ bonding with F− Balance the charges. Na+ F− (1+) + (1-) = 0 1 Na+ and 1 F− = NaF

  8. Write an ionic formula for K+ bonding with S2− Balance the charges. K+ S2− K+ 2(1+) + (2-) = 0 2 K+ and 1 S2− = K2S

  9. Write an ionic formula for Fe3+ bonding with OH− Balance the charges. Fe3+ OH− OH− OH− (3+) + 3(1-) = 0 1 Fe3+ and 3 OH− = Fe(OH)3

  10. Write the formula for… an ionic compound composed of: Al3+ and S2- Al2S3

  11. Write the formula for… an ionic compound composed of: Fe2+ and SO42- FeSO4

  12. Write the formula for… an ionic compound composed of: Cd2+ and NO2- Cd(NO2)2

  13. Write the formula for… an ionic compound composed of: Ag+ and CO32- Ag2CO3

  14. Write the formula for… an ionic compound composed of: Pb2+ and NO3- Pb(NO3)2

  15. Write the formula for… an ionic compound composed of: Hg2+ and PO43- Hg3(PO4)2

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