Core Periodicity I: Chemical Properties

Core Periodicity: Chemical Properties

Slide 14 of 31

Pattern Across a period: Metallic to non-metallic

Going across a period the elements change from metallic to non-metallic.

We will look at the properties of Period 3.

1. Metals are shiny and lustrous, malleable and ductile while non-metals in general, if solid, are dull and brittle.

–Sodium, magnesium and aluminum in this period are metals while silicon, phosphorus, sulfur and chlorine are nonmetals.

–(Metallic character increases down a group.)

2. Metals are characterized by low ionization energies while those of nonmetals are high.

–Ionization energy increases across this period.

3. Most neutral metals are oxidized while most non-metals are reduced.

–Sodium, magnesium and aluminum are oxidized (lose electrons and form cations) while phosphorus, sulfur and chlorine are reduced (gain electrons and form anions).