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Ch.5, Section 1
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Some electrons are found close to the nucleus of an atom Remember, they have low energy levels Electrons found furthest away from the nucleus are valence electrons. They have the highest energy levels They are held loosely and used for bonding.
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They determine the stability of an atom. Atoms with 8 valence electrons are the most stable and un-reactive. They will not form compounds easily. If an atom has less than 8 valence electrons, it will be more reactive. It may give up or take electrons with other elements to become stable.
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A way to model an element’s valence electrons Includes the element’s symbol & valence electrons
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Transition Metals 1-3 valence e-
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Sodium (Na) is in Group 1. How many Valence electrons does it have? Draw the dot diagram for Sodium. Oxygen has 6 valence electrons. Draw the dot diagram for Oxygen.
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How many valence e- do the transition metals have? What are valence electrons? The most stable elements have how many valence electrons? What would a dot diagram for carbon look like? How many valence e- does phosphorous have? Calcium? Argon?
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Chapter 5, Section 1 Assessment Questions Turn Into Google Classroom
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