Chemistry 1-6-09 Periofic Trends, Part 1
CHEMISTRY: Here’s the lecture from Tuesday on the beginning of the end of chapter 5. 
We began by review some periodic trends like electron configurations and valence electrons. Then, we talked about atomic radii and ionization energy. We’ll try to finish the discussion tomorrow and Thursday.
January 6th, 2009 at 10:53 PM
Who discovered that the periodic table shows trends of atomic mass, reactivity, etc…?
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January 6th, 2009 at 10:53 PM
What does the definition of a trend mean?
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January 6th, 2009 at 10:54 PM
Who discovered that the periodic table exhibits trends of atomic mass, reactivity, etc…?
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January 6th, 2009 at 10:55 PM
sorry i didnt mean to post that twice :]
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January 7th, 2009 at 5:59 PM
I don’t think that someone in particular “discovered” the trends. They are just kind of facts that were noticed after a variety of scientists calculated atomic radius, reactivity, and other stuff like that. :]
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January 7th, 2009 at 6:10 PM
Good dialog guys! Great answer, Mary Gates!
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January 8th, 2009 at 8:18 PM
What are negative ions called?
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January 9th, 2009 at 2:47 PM
cations
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January 9th, 2009 at 2:48 PM
Jake,i believe a negative ion is called an anion.
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January 9th, 2009 at 2:50 PM
maybe i shouldnt have left the computer lab and you type it in for me and try to make me look dumb
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