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OpenStudy (asad786):
plz help http://prntscr.com/a1ur2q
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OpenStudy (lizardman449):
The answer is C. NOW LOOK WHY: Lithium is number 3 (1, 2) on the periodic table and is in the Alkali Metals category. Sodium is number 11, (1, 3) and is in the same category. And finally, Potassium is number 19 (1, 4) and is also in the Alkali Metals category. Sense they are all in the same category, they are to most similar of the combinations in the other options. Does that make sense?
OpenStudy (lizardman449):
Also, you could have put this in the Chemistry category to get a faster answer.
OpenStudy (asad786):
thx
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