Periodicity

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a virtual textbook chapter of periodicity for IB Chem SL

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By: doug.abshire (119 month(s) ago)

how about makig this downloadable?..... good job.....

Presentation Transcript

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Periodicity Virtual Textbook 2.0

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What would you like to know? General Knowledge: About the Table How to read it Metalloids The Non-metals Noble Gasses The Halogens The Metals Trends: Left to right Going down (group 7) Going down (group 1) Practice Problems: Problem 1 Problem 2 I’m Done

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Left to Right Trend Elect-negativity Atomic Radius Why: This occurs because as you go left to right the Number of protons increases and that increases the pull on the shells Back

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Going down (group 1) Atomic Radius This occurs because there is a smaller amount of protons as you go down the period so there is a smaller pull on the shells. Electro-negativity This occurs because there is more shielding meaning that there is less pull on the valence electrons and that it will be easier to pull one off. Li Fr Fr Li Back

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Going down (group 7) Atomic Radius F I This occurs because there is a smaller amount of protons as you go down the period so there is a smaller pull on the shells. I F This occurs because there is more shielding meaning that there is less pull on the valence electrons and that it will be easier to pull one off. Back Electro-negativity

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Metalloids The Metalloids are the steps between the transition metals and the non metals Back

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The Metals From top to bottom (group) the metals metallic properties increase Properties: Solid at room temperature Greater density then water Malleable Ductile Shiny Good conductors Low Electro-negativity Back oooo shiny!!!

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The Non-metals Mainly gases at room temperature Not malleable or Ductile, Can be brittle Dull Very bad Conductors Want to gain electrons because of octet rule Back

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Noble Gasses These elements do not react (naturally) and are therefore “Mono-Atomic Molecules” Previously referred to as inert gasses Back

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The Halogens These are non-metals but as you move down in Group do show some metallic properties Easily bonds with elements from group 1 to form salts Halogens are the only elements in each state Back Had no picture for halogens. :P

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About the Table Creator: Dimitri Mendelev Why: When the elements are arranged by atomic value certain properties appear and masses do not repeat. (modern periodic law) Fact: many of the element symbols were derived from there Latin root Back

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How to Read It Periods: the periods are the horizontal rows. The Groups: The groups are the horizontal Columns Noble Gases The Metals The Metalloids Halogens alkaline earth alkaline Transition Metals Non-Metals Back

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Which pair of elements reacts most readily? A. Li + Br2 B. Li + Cl2 C. K + Br2 D. K + Cl2 Explanation Back

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Which of the following properties of the halogens increase from F to I? I. Atomic radius II. Melting point III. Electro-negativity A. I only B. I and II only C. I and III only D. I, II and III Explanation Back

Answer 1 : 

Answer 1 The answer is D. its D because Potassium has a higher lower electro-negativity than Lithium so it will react more readily, and Chlorine has a greater pull because it has a higher electro-negativity than BR due to the amount of shielding. Back

Answer 2 : 

Answer 2 The Answer is B. Refer to “going down Group 1” and “going down Group 7” Back

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GOOD JOB!! Back

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Hope it helped

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