Tuesday 8 December 2015

Lecture 2 – Ionic Compounds

ACKNOWLEDGEMENT:

Figure
Source of Figure
Figure 14a
www.gcsescience.com
Figure 14b
en.wikibooks.org
Figure 14c
www.truthinaging.com
Figure 15
www.veselasola.net


Ionic Bonding in MgCl2:

In magnesium chloride, MgCl2, Magnesium loses both its valence electrons to gain noble gas configuration. These 2 electrons are gained by 2 atoms of chlorine, 1 each to form 2 chloride ions.

Figure 14a: Molecule of Magnesium chloride



Figure 14b: Arrangement of ions in the ionic lattice

Figure 14c: Original Appearance


Ionic compounds form ionic lattices in which the cations and anions are arranged in a periodic order and at equal distances from one another. Each cation is surrounded by 6 anions and each anion is surrounded by 6 cations at equal distances. Figure 15 shows the arrangement.

Figure 15:



The ions being alternatively charged create strong electrostatic forces of attraction; giving the lattice its definite shape, strength, and high melting and boiling points.