I believe its Calcium, because it is in group 2, and Bromine is not in group one or two, making Calcium more reactive.
Calcium, period 4 group 2, very reactive
Chlorine
Calcium is more reactive but not as Potassium or Sodium because according to the displacement series Calcium comes as third and the last under the reactive elements of the displacement series.
Iron will react with calcium oxide as iron is more reactive than calcium, therefore calcium (which is the more reactive metal) will displace calcium (the less reactive metal) to form a compound. This is called a displacement reaction.
In most cases, chlorine is more reactive than bromine. This occurs because chlorine has a higher electronegativity than bromine. Thus, chlorine tends to take electrons from other substances more readily than bromine, and thus is more reactive.
Something more reactive than bromine. Chlorine or fluorine would do it.
Bromine is way more reactive
Chlorine is more reactive
Bromine has more nuclear charge as compared to iodine. So, bromine easily attracts an electron and hence more reactive.
calcium
No, strontium is more reactive than calcium.
Bromine is more active.
Calcium, period 4 group 2, very reactive
Chlorine
mercury
Calcium is more reactive but not as Potassium or Sodium because according to the displacement series Calcium comes as third and the last under the reactive elements of the displacement series.
Chemistry of calcium Calcium is generally more reactive than magnesium