Sodium vs Potassium . Metal 's reactivity depends on the ability to lose electrons. well... since potassium is lower than sodium, i guess thats why? Both sodium and potassium ions are essential for all life forms. The ability to lose electrons increases down a group and right to left in a period. That’s why when Mg is placed in KCl, no reaction occurs. As you can see on the periodic table in Group 1, Potassium is lower than Sodium. Mg(s) + KCl 2 (aq) --> No reaction Displacement of oxides. The Thermit Reaction is an example of displacement of oxides.  2Br-(aq) + Cl2(g) → Br2(g) + 2Cl-(aq)  Explain, in terms of electrons, why chlorine is more reactive than bromine. Why potassium is more reactive than sodium . 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. 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. 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. 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+. So potassium is more reactive than sodium and sodium is more reactive than lithium. the lower down THAT list, the more reactive it is. Potassium is the most reactive because less energy is required to remove the outer electron from its atom; the size of the atom is bigger and therefore the atom is furthr away from the nucleus and the outer electron is therefore less strongly attracted to the nucleus. potassium is lower in the group compared to sodium in the periodic table which makes it more reactive. Hence, potassium is more reactive than sodium. (b) Sea water contains bromide ions (Br-). Both ions are highly reactive and easily dissolve in water which is why both are found more in seawater than … Sodium and Potassium are naturally occurring alkaline metals that show many similarities in their behaviors. the cost of an element depends on its abundance on the earth and its process of extraction. Loss of electrons is due to it’s less reactive as less reactive metal has higher chance of losing electrons. 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. as for the very in-depth reason.... ask a chemist >.< Why is potassium more reactive than sodium or lithium? Therefore potassium is the most reactive … The metals become more reactive with increasing atomic number. Thus, in potassium, the outermost electron is better shielded from the attractive force of the nucleus. This is due to increase in atomic size and less nuclear charge.The atomic radius of potassium is bigger than sodium.


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