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PERIODIC TABLE - Coggle Diagram

- - - - Elements are listed in numerical order by the number of protons in an atom of an element. So element number 1 (hydrogen) is the first element.
      - Each horizontal row in the periodic table is called a "period". There are 7 periods in the periodic table. Elements in the same period all have the same electron ground state energy level.
      - Each vertical column on the periodic table is called a "group". Elements belonging to one of the 18 groups will share similar properties. Atoms of each element within a group have the same number of electrons in their outermost electron shell
      - The two rows of elements found below the periodic table are the lanthanides and actinides, are special transition metals.