Explain why potassium is more reactive than sodium, giving the balanced chemical symbol equation for the reaction of potassium and water.

K + H2O --> KOH + H2Both potassium and sodium possess one electron in their outer shell. Both elements readily give up this unpaired electron and so for this reason are considered very reactive elements. Potassium is placed one period below sodium in period 4. Therefore, potassium has an additional shell of electrons and thus 8 more electrons. This extra shell of electrons shields the attractive force exerted on the outer electron by the nucleus. As a result, less energy is required to remove the outer electron of potassium and so it is more reactive.

Answered by Liam F. Chemistry tutor

46570 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

What is the electron arrangement of Potassium (K)?


Aluminium is protected from rust by a layer of oxidised Al2O3. Can you write a balanced equation for the formation of this layer?


Predict the products of electrolysis of molten calcium chloride and explain which ions are at each electrode


How would you carry out a flame test and what colours would Li+, Na+, K+ and Ca2+ ions form?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences