Question

Describe the trends properties of period 3 elements

Answer 1

Answer:

Melting and boiling points rise across the three metals because of the increasing strength of the metallic bonds. The number of electrons which each atom can contribute to the delocalised "sea of electrons" increases. The atoms also get smaller and have more protons as you go from sodium to magnesium to aluminium

Answer 2

Answer:

Key Concepts

Period 3 Elements Na Cl

Trend: Electronegativity lowest highest

General Melting Point higher lower

Physical Description shiny-grey "metallic" solid greenish-yellow gas

Metallic Character metals non-metals