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What's the difference between Na+ and Na?
Ions have properties that are completely different from those of their parent atoms. Chemical change usually involves
the valence electrons. Ionization changes the number of electrons in the valence shell and so has a strong effect on chemical behavior.
In the case of sodium, ionizing the atom completely removes the 3s valence shell. The remaining electrons are tightly bound and require far more energy to remove. As a result, the sodium ion is far more inert than the sodium atom.
Table Some differences in chemical and physical properties for sodium ion and sodium atom.
||soft, shiny metal
||not found pure; must be combined with anions to form stable ionic compounds
|reaction with water
||violent exothermic reaction with water forms Na+(aq), OH-(aq), H2(g)
||Na+ dissolves in water without further reaction
|reaction with hydrogen gas
||2 Na(s) + H2(g) 2 NaH(s)
|reaction with oxygen gas
||2 Na(s) + O2(g) Na2O2(s)
|reaction with alcohol
||2 Na(s) + 2 C2H5OH()
2 NaOC2H5 + H2(g)
||Na(s) is an excellent conductor of heat and electricity
||Na+ solid compounds are poor conductors of heat and electricity; Na+ in aqueous solution conducts electricity
Author: Fred Senese firstname.lastname@example.org