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chem

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
What is periodic law?   In order of atomic number, properties of elements that change across, repeat themselves in the next row.  
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Periodic Table Arrangement: - A (IA to VIIIA) - B (IB to VIIIB) - two rows below   A - main group (1-20) B - transitional metals Lathanides & Actinides  
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What does the diagonal separate?   The diagonal line separates metallic from non-metallic elements.  
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Properties of metals:   Conduct heat and electricity; Shiny in appearance; Malleable (can be easily shaped); Solid at room temperature (exception: liquid mercury)  
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Properties of non-metals:   Do not conduct heat and electricity; Dull in appearance, many colours; Brittle; Liquid or gas at room temperature  
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What is group IA? What are its properties?   Alkali Metals; Highly reactive - stored in oil to avoid reacting with air or moisture  
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What is group IIA? What are its properties?   Alkaline earth metals; Not as highly reactive - do not need to be stored in oil  
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What is group VIIA? What are its properties?   Halogen Family; Highly reactive non-metals  
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What is group VIIIA? What are its properties?   Noble gas family; Most stable and least reactive elements known  
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Three main periodic trends:   1) Atomic Radius 2) Ionization Energy 3) Electronegativity  
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Atomic Radius trend:   1) Atomic sizes get larger as you move down a family - added energy level increases atomic size and radius 2) Atoms get smaller as you go across a period. - more e- in outermost level gives stronger nuclear charge, pulls inward, shrinking atom and radi  
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First Ionization Energy trend:   1) I.E. decreases down a family 2) I.E. increases across a period  
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What is a cation?    
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