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IONIC COMPOUNDS

IONIC COMPOUNDS. Joining Atoms Together. Questions. How can a soldium atom get rid of its “extra” electron to become chemically stable Where can a fluorine atom get the extra electron it needs to make a stable octet? What is a stable octet?. Valence.

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IONIC COMPOUNDS

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  1. IONIC COMPOUNDS Joining Atoms Together

  2. Questions • How can a soldium atom get rid of its “extra” electron to become chemically stable • Where can a fluorine atom get the extra electron it needs to make a stable octet? • What is a stable octet?

  3. Valence • The outer energy shell of an atom is called its VALENCE SHELL • The electrons in the valence shell are called the VALENCE ELECTRONS

  4. NaFl • With Na and Fl, the concept of electron rearrangement explains the formation of the compound sodium fluoride. • Both atoms lose their original properties. • Fluorine now has a slightly negative charge • Sodium now has slightly positive charge • Where do you think you might find NaFl

  5. What bonds with what? • Look at the table… knowing how ionic bonds form, how might the different groups bond with each other? • Ionic bonds form between metals and non-metals

  6. How many…? • Alkali metals + Halogens • Alkaline Earth Metals + Halogens • Alkali Metals + Oxygen group

  7. Ions • Atoms are neutral (charge) because they have the same number of electrons and protons. • When an atom gains or loses an electron it becomes an ion ( + or -) • Na becomes Na+ • Cl becomes Cl- • O becomes O2-

  8. sodium chloride • NaCl, Na completely transfers an electron to Clhas low electronegativity; Cl has high electronegativity. The Cl will completely remove from Na its only valence electron. • The result is that both atoms will have full octets. • The positive and negative ions that form attract one another to form the compound.

  9. What forms Ionic bonds • What elements can you predict will form ionic bonds? • Ionic bonds are formed between metals and non metals.

  10. Strong Compounds • Ions in an ionic compound form regluar, repeating patterns called a crystal lattice • The bond is very strong and the same in all directions • Solid ionic compounds are hard and don’t conduct electricity well. • In water the ions separate

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