chap3bonding30a

chap3bonding30a - Bonding Chapter 3 Types of Bonds to form...

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1 Bonding Chapter 3 Types of Bonds to form Compounds 1) Valence e’ e’ in outermost shell are called valence electrons Ca (20 e’) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 2 valence e’ S (16 e’) 1s 2 2s 2 2p 6 3s 2 3p 4 6 valence e’ Ar (20 e’) 1s 2 2s 2 2p 6 3s 2 3p 6 8 valence e’ The group number refers to the valence e’ Electron Dot Structure- Put the number of valence e’ around the atomic symbol. 2) Octect Rule Noble gasses are extra stable because they have eight valence e’. The p orbitals are filled. All other elements want to achieve the noble gas e’ configuration. Li Be B C N F Ne O
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2 3) Formation of ions- Ions are charged species. Cation- positive charge Anion- negative charge A) Positive ions- cations Na loses 1 e’ to become Na + 1s 2 2s 2 2p 6 3s 1 --------- 1s 2 2s 2 2p 6 + 1e’ B) Negative Ions- anions Mg 12 p 12 e' 1s 2 2s 2 2p 6 3s 2 2e 8e 2e 1s 2 2s 2 2p 6 2e Same as Ne
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3 N gains 3e’ to become N 3- 1s 2 2s 2 2p 3 + 3e’ -------- 1s 2 2s 2 2p 6 Group number will determine the number of electrons given up or accepted Group electrons- group 4 usually has no charge. Group 1 2 3 5 6 7 Charge +1 +2 +3 -3 -2 -1 Metals take on positive charges, Non-metals negative charges. Transition metals can have variable positive charges. Examples
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chap3bonding30a - Bonding Chapter 3 Types of Bonds to form...

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