Sodium and Potassium are naturally occurring alkaline metals that show many similarities in their behaviors. So potassium is more reactive than sodium and sodium is more reactive than lithium. well... since potassium is lower than sodium, i guess thats why? Both sodium and potassium ions are essential for all life forms. Thus, in potassium, the outermost electron is better shielded from the attractive force of the nucleus. It follows, therefore, that this outermost electron is more easily lost than it is in sodium, so potassium can form K+ more readily than sodium can form Na+. That’s why when Mg is placed in KCl, no reaction occurs. This is due to increase in atomic size and less nuclear charge.The atomic radius of potassium is bigger than sodium. The Thermit Reaction is an example of displacement of oxides. (b) Sea water contains bromide ions (Br-). the cost of an element depends on its abundance on the earth and its process of extraction. having said that, since lithium is the top, its the least reactive, as francium is the lowest, it is the most reactive (hence you will never find it in its pure form in nature. Why potassium is more reactive than sodium . as for the very in-depth reason.... ask a chemist >.< As you can see on the periodic table in Group 1, Potassium is lower than Sodium. Therefore potassium is the most reactive … the lower down THAT list, the more reactive it is. Outer electron of a potassium atom is furthest within these three metals from its nucleus than the outer electron of a sodium and lithium atom. Hence, potassium is more reactive than sodium. The bromide ions can be changed to bromine by bubbling chlorine gas into sea water. Chlorine is able to displace bromine from sea water because chlorine is more reactive than bromine. Sodium vs Potassium . As you go down the group, elements are more reactive because a electron shell is added to each element, so valence electrons will be further away from the nucleus, and because of that, the nucleus is not able to have much of a "hold" on the valence electrons causing the element to be more reactive. Metal 's reactivity depends on the ability to lose electrons. The ability to lose electrons increases down a group and right to left in a period. Both ions are highly reactive and easily dissolve in water which is why both are found more in seawater than … The metals become more reactive with increasing atomic number. potassium is lower in the group compared to sodium in the periodic table which makes it more reactive. Loss of electrons is due to it’s less reactive as less reactive metal has higher chance of losing electrons. Why is potassium more reactive than sodium or lithium? 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