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Transcript
1) BellRinger: Remind – Read article and then do a Sentence Phrase Word 2) Worksheet #26 3)QUIZ #9 Draw Picture of a sodium and chlorine atom: Now, draw a picture of a sodium and chloride ion: Cations and Anions • Cations are ions with a POSITIVE charge. • Anions are ions with a NEGATIVE charge. • Draw the funny way to remember cations and anions: • Compounds • Atoms bonded together with an IONIC bond are called ionic compounds. • An ionic bond is a METAL bonded with a NONMETAL. • Draw the crystal lattice structure for sodium chloride: • Empirical Formula • Refers to the ratio of ions in a compound • NaCl has a ratio of 1:1 (1 to 1). • MgCl2 has a ratio of 1:2 (1 to 2). • AlCl3 has a ratio of 1:3 (1 to 3). Lewis Dot Structures Dots used to represent VALENCE electrons around an atom. Lewis Dot Structures • Sodium 2) Chlorine 3) Magnesium 4) Oxygen 5) Nitrogen Carbon Oxidation Number • Charge that an atom will have if made into an ion. • Na becomes Na+, so its oxidation 1+ number is . • Cl becomes Cl-, so its oxidation number is 1- . Magnesium has 2 valence electrons Magnesium has a 2+ charge Flourine has 7 valence electrons Flourine has a 1- charge Mg (2+) MgF2 F (-1) F(-1) Ionic Combinations • Sodium oxide (Sodium and oxygen) Na (+1) Na(+1) Na2O O(2-) MgO Mg (2+) Cancel out perfectly O (2-) Criss -Cross Method • Lithium oxide REACTION OF SODIUM AND CHLORINE • Video IONISATION • Video QUIZ #9 1)Draw the Lewis dot structure for Aluminum 2) Give the chemical formula for lithium and fluorine coming together.
