In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the Periodic Table later?
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The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element
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Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
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The arrangement of elements in the Modem Periodic Table is based on their
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At the time of Mendeleev, the number of elements known was
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Newlands relation is called
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Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?
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Upto which element, the Law of Octaves was found applicable?
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The atom of an element has electronic con-figuration 2, 8, 7. To which of the following elements would it be chemically similar?
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Magnesium has an atomic number of
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In period from left to right electron affinity of elements
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Recurrence of same pattern in periodic table is called its
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