(1) Using Dobereiner's law of triads, find the Li Na K missing number. 7 ,39
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In mathematics, an integral assigns numbers to functions in a way that describes displacement, area, volume, and other concepts that arise by combining infinitesimal data. The process of finding integrals is called integration.
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According to the Dobereiner middle elements atomic mass is arithmetic mean of 1st and 3rd elements mass thus
Mass of Na. = (7+39)/2=23
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