Core
Reactions: Redox
Slide 9 of 42
Charge
Charge on a monatomic ion therefore results from a gain or
loss of electrons.
Na ® Na+ + e– Cl + e– ® Cl–
Mg ® Mg2+ + 2e– O + 2e– ® O–2
Since ionic compounds are made up of ions, they consist of
positively and negatively charged particles.
–For
example, NaCl consists of positive Na ions (Na+) and negative Cl
ions (Cl- ).
Polyatomic ions such as SO4–2, PO4–3 are negatively charged because they have more
electrons than protons, while NH4+ is positively charged because it has one
less electron than protons.
Covalent compound however consist of molecules that are made up
of neutral atoms, they are chargeless.