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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Presentation transcript:

Day The elements in group 17 are called the ____________. 2.They all have ____ valence elecs. 3.They are the __________ reactive nonmetals.

Day The elements in group 2 are called the ____________. 2.They all have ____ valence elecs.

How is the periodic table arranged? Day

Online Assignment shssci.wikispaces.com

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

Periodic Trends Atomic radius: - Measure of size – radius of an atom

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

Periodic Trends What are ions? - If an atom loses elecs. it becomes smaller - If an atom gains elecs. it becomes larger PAGE Which elements gain elecs.? Which elements lose elecs.? Pattern?

Periodic Trends Elements on the right side of the periodic table form _________ ions Elements in the same group form ___________ ions negative The same

Periodic Trends What’s bigger: F or F - Na or Na + Na or Rb Na of Al F or Cl -

Quick Draw Group Halogens Reactivity Period Transition metals Atomic radius

Day Which of the following are larger? F OR S Give at least 2 reasons why.

Day Which of the following are larger? Ca OR Sr Cs OR Cs +1 Rb OR Ca +2

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

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

Electronegativity – ability to attract electrons in a bond Na—Cl … In the compound above electrons shift toward Cl because it is more electronegative!

What is electronegativity? How does it increase on the p. t. ? Electronegativity – ability to attract electrons in a bond

How does it increase on the p. t. ? In this bond: Mg—O, which way do elecs. Shift? WHY? O, > electroneg.

Add the following trends: Reactivity Size (atomic radius) Electronegativity

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!!!

Ionization energy Fluorine Noble gas Inert Group 17 Malleable Ductile Alkali metals Francium Period 4 Electronegativity Octet Rule Double periods

C B A

Atomic mass *** _________ *** _______ Similar properties: _______________ __________________ (groups) Families