enganchadaalaciencia.es - 6 - Atoms, molecules, crystalline lattices.

5 - ATOMS, MOLECULES AND CRYSTALLINE LATTICES

Pure substances can be either simple substances or compounds. The way their atoms are arranged depend on their atoms' valence shell.

SIMPLE SUBSTANCES: They consist of atoms of only one element. How can we find them in Nature? There are three possible structures:

1) ISOLATED ATOMS-

2) CRYSTALLINE LATTICES- they can be either covalent crystalline lattices or metallic crystalline lattices.

COVALENT CRYSTALLINE LATTICES-diamond

METALLIC CRYSTALLINE LATTICE- iron (BCC structure)

3) MOLECULES - a group of atoms of the same element connected by covalent bonds.

COMPOUNDS: They consist of atoms of more than one element. They can be found in two different structures:

1) MOLECULES- A molecule is a group of atoms connected by covalent bonds.

2) CRYSTALLINE LATTICES-

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