atomic mass of scandiumand silicon
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chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest.[1] When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium and eka-silicon, with respective atomic masses of 44, 68, and 72.
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Answer:eka-boron, eka-aluminium and eka-silicon, with respective atomic masses of 44, 68, and 72.
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