Gap-fill worksheet question Quiz "Simple Covalent Molecular Substances"

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   bigger      covalent bond      diamond      free electrons      halogens      hard crystals      high electrical conductivity      high melting points      increase      intermolecular forces      low electrical conductivity      low melting points      non-metals      sharing      soft crystals      strong      strong bond      weak      weak force   
Image508.gif 1a. A is formed by two atoms one or more pairs of electrons to make a between the two atoms in a molecule.
Image522.gif1b. However, between small molecules, only a holds them together in the bulk liquid or solid.
1c. This results in small covalent molecules having and if solid.
1d. Small covalent molecules have no and so have a .

silica.gifX2group7.gif 2a. The Group 7 collectively known as the form diatomic molecules of two atoms.
2b. The between the molecules are giving them relatively low melting points and boiling points.
2c. This also explains why they are gases, liquids or solids with .
2d. As you go down Group 7 the melting boiling points and boiling points because the molecules get and the intermolecular forces .

3a. In giant covalent structures the forces between all the atoms are forming like or silica .
3b. In the atomic giant structure metals there are free electrons which allow .