Core Periodicity IV: Physical Properties

Core Periodicity: Physical Properties

Slide 23 of 35

Summary

2. the number of electrons

This becomes relevant between/amongst species with the same number of shells but one or more of the species has a negative charge and of these there are three different cases:

I. Between/amongst species with not only the same number of shells, but also same nuclear charge but differing number of electrons

-Such as between an atom and it’s negative ion (P and P3-)

II. Between/amongst isoelectronic negatively charged species

-Such as between two anions from the same period (N3- and O2- or S2- and Cl-),

III. Between/amongst isoelectronic negatively charged and neutral or positively charged species

-Between an anion and neutral atom in the same period (N3- and Ne).

-Between an anion and a cation with the same number of shells (Mg2+ and N3-)

-Here the bigger the number of electrons the bigger the electronic repulsion and therefore the weaker the force of attraction.