Boron is a metalloid but still it is in the 3rd period in the periodic table which does not have 4 valance electrons. Why is it so?
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Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-Silicon and Eka-aluminium (a) Name the elements which have taken the place of these elements (b) Mention the group and the period of these electron in the modern periodic table (c) Classify these elements as metals, non-metals or metalloids (d) How many valence electrons are present in each one of them ?
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