Fill in the Blanks 8.5C_FillIntheBlank_StrRvwOnline version fill in the blank staar review by Andrea Soliz 1 valence electrons Elements metals levels groups properties Table metalloids Periodic noble nonmetals periods energy gases In the 1800 ? s Dmitri Mendeleev developed a clever way to organize the elements into what is now known as the of . In this system , the elements are organized into rows called and into columns called . Each group has elements with the same number of , which affect how the elements in each group react . Each period has elements with the same number of . Due to the fact that the elements are organized by their characteristics into periods and groups , elements in similar areas of the periodic table are also organized by their physical . The category that most of the elements are in is the , which is characterized by shiny , malleable , and conductive elements . Another category found in the upper right of the period table is the , which is characterized by brittle , dull , and nonconductive elements . A special section of the non - metals found in group 18 are called the because of their stability . Finally , along the " steps " of the periodic table is a category of elements that have both metal and non - metal properties , called the .
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