Answer: potassium calcium chromium
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    Chromium  calcium  and potassium are near each other on the periodic table  and have some common characteristics but differ in chemical reactivity.  Which lists these metals in order from most reactive to least reactive?         
Beryllium is a  chemical  element with the symbol Be and atomic number 4. It is a relatively rare  element in the universe  usually occurring as a product of the spallation  of larger atomic nuclei that  have  collided with cosmic rays.Within the cores of stars  beryllium is depleted  as it is fused into heavier elements. It is a divalent element which occurs  naturally only in combination with  other  ... 
Manganese is a  chemical  element with the symbol Mn and atomic number 25. It is not found as a free  element in nature; [not verified in body] it is often found in minerals in  combination with iron.Manganese is a transition metal with a multifaceted  array of industrial alloy uses  particularly in stainless steels..  Historically  manganese is named for pyrolusite and  other  black minerals from the ...   
Alkaline earth metal - Wikipedia       
Chromium - Wikipedia       
Chromium - Wikipedia       
Chromium - Wikipedia       
Chromium  is a  chemical  element with the symbol Cr and atomic number 24. It is the first element  in group 6.It is a steely-grey  lustrous  hard and brittle transition  metal.  Chromium  is the main additive in stainless steel  to which it adds anti-corrosive  properties. Chromium  is also highly valued as a metal that is able to be highly polished while  resisting tarnishing.
Iodine is a  chemical...
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