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Day 4 1-23 1.The elements in group 17 are called the ____________. 2.They all have ____ valence elecs. 3.They are the __________ reactive nonmetals.
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Day 5 1-24 1.The elements in group 2 are called the ____________. 2.They all have ____ valence elecs.
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How is the periodic table arranged? Day 2 1-19
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Online Assignment shssci.wikispaces.com
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Metals Excellent conductors (Sea of electrons) even as solids Mobile electrons Metals are malleable and ductile Can be pounded into sheet Can be pulled into wire
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Periodic Trends Atomic radius: - Measure of size – radius of an atom
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Periodic Trends What are ions? - atoms that are charged due to the loss or gain of electrons - If an atom loses elecs. it becomes smaller and positive - If an atom gains elecs. it becomes larger and negative Notes page 4
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Periodic Trends What are ions? - If an atom loses elecs. it becomes smaller - If an atom gains elecs. it becomes larger PAGE 176-179 Which elements gain elecs.? Which elements lose elecs.? Pattern?
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Periodic Trends Elements on the right side of the periodic table form _________ ions Elements in the same group form ___________ ions negative The same
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Periodic Trends What’s bigger: F or F - Na or Na + Na or Rb Na of Al F or Cl -
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Quick Draw Group Halogens Reactivity Period Transition metals Atomic radius
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Day 6 1-25 1.Which of the following are larger? F OR S -2 2. Give at least 2 reasons why.
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Day 6 1-25 1.Which of the following are larger? Ca OR Sr Cs OR Cs +1 Rb OR Ca +2
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Question of the Day 1. What element is in Group 13, Period 3? 2. Name an element in Group 4 3. How many valence electrons in Xe? Day 1 1-26
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Octet rule – Atoms tend to gain, lose, or share electrons in order to acquire a full set of valence electrons (8) - 2 for H, He, Li, Be, + B notes page 6
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Electronegativity – ability to attract electrons in a bond Na—Cl … In the compound above electrons shift toward Cl because it is more electronegative!
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What is electronegativity? How does it increase on the p. t. ? Electronegativity – ability to attract electrons in a bond
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How does it increase on the p. t. ? In this bond: Mg—O, which way do elecs. Shift? WHY? O, > electroneg.
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Add the following trends: Reactivity Size (atomic radius) Electronegativity
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Assignments Online assignment = shssci.wikispaces.com Read section 6.3 and complete #s 18, 19, 21, 22, 24, 25 on page 182 BOTH DUE BY THE END OF THE PERIOD!!!
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Ionization energy Fluorine Noble gas Inert Group 17 Malleable Ductile Alkali metals Francium Period 4 Electronegativity Octet Rule Double periods
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C B A
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Atomic mass *** _________ *** _______ Similar properties: _______________ __________________ (groups) Families
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