1) Who is the scientist who worked in Russia and arranged the elements in order of increasing atomic mass while putting in groups those with similar properties? 2) YOUR LUCKY TODAY! Call a friend to pick another number. 3) Who is the English physicist who observed that the order of the X-ray frequencies emitted by elements follows the ordering of the elements by atomic number? 4) In periodic table of elements, the principal families of elements Group 1 is named as the________? 5) Group 3 to Group 12 constitutes one block wherein elements in this block are referred as the_________? 6) We use the periodic table to identify the known elements as metals, nonmetals, and semimetals or metalloids. As shown in the figure, elements along the stair step line are called_______? 7) YOUR LUCKY TODAY! Call a friend to pick another number.

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