PERIODIC TABLE

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    • a tabular arrangement of elements, highlighting the regular repetition of properties
      the periodic table
    • Dmitri Mendeleev created the periodic table of elements
    • consists of elements in a row
      period
    • consists of elements in columns
      group
    • four general categories of elements
      bohr groups
    • main elements composed of metals and non-metals; s and p subshells are being filled
      A group
    • non-metals at the end of each period; noble gases; all have completely filled subshells except for He
      O group
    • metals where the d subshell is being filled
      transition elements
    • metals where the f subshell is being filled; includes the lanthanide (rare Earth elements) and actinide (radioactive elements)

      inner transition metals
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