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Focus on Valence Electrons: Draw valence for Na and Cl: NaCl What will happen when the two elements are combined? Na will transfer 1 electron to Cl Now,

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Presentation on theme: "Focus on Valence Electrons: Draw valence for Na and Cl: NaCl What will happen when the two elements are combined? Na will transfer 1 electron to Cl Now,"— Presentation transcript:

1 Focus on Valence Electrons: Draw valence for Na and Cl: NaCl What will happen when the two elements are combined? Na will transfer 1 electron to Cl Now, both atoms have full valence! Na +1 Cl -1 Opposite charges attract and ionic bond forms between Na & Cl To write compound: 1 atom of Na needed for every 1 atom of Cl. So, compound formula = NaCl This is one molecule of NaCl

2 What happens when Na and Ca combine together? Write the ions for Na and Ca: Na +1 andCa +2 So, both ions are positive and so would repel each other Both atoms are trying to lose electrons.

3 What is the easiest way for potassium (K) to follow the Octet Rule? Lose 1 electron What is potassium’s oxidation number? +1 What is the easiest way for nitrogen (N) to follow the Octet Rule? Add 3 electrons What is nitrogen’s oxidation number? -3

4 Draw the valence of 3 K and 3 N atoms: K K K N N N What will happen when you combine these two elements? K loses 1 electron to N This K atom has a full valence But, this N atom does NOT have a full valence So, another K atom will lose an electron to N This K atom has a full valence How do you determine the compound formula? How many atoms are left with full valence  These are the atoms in one molecule Always write POSITIVE ion first! Compound Formula = K 3 N

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