Why is the Mg2+ ion smaller in radius than the Na+ ion?

To answer this we need to compare the two ions. The main difference between the two ions is the number of protons in the nucleus - Magnesium has one more proton than Sodium, however, if you look at the electron configurations of the two, they will be the same, so called isoelectronic (i.e. 1s^2 2s^2 2p^6). The higher positive charge on the nucleus in magnesium causes a stronger attraction on the negatively charged electrons ($$F \propto q_1 q_2$$), and so the ion has a smaller ionic radius.

Answered by Jonathan H. Chemistry tutor

13358 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

Why are the theoretical and Born Haber lattice enthalpies different?


In terms of Electrostatic Forces, Suggest why the ‘Electron Affinity’ of Fluorine has a Negative value.


What is a nucleophile and what is an electrophile?


State the crystal structures of SiO2 and CO2 and why one has a higher melting point than the other.


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