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Periodic Table First 20

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I was staring at my mug. My usual coffee break routine… At that time, I was figuring out how to memorize my PEG System table, along with the major System. Then i thought : “How much time do you spend in front of your plain white coffee mug every day http://elliottrsrqp.blogs-service.com/10361793/how-to-memorise-the-first-20-elements

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