Both aluminum Floride (ALF3) and phosphorus trifluoride (Pf3) contain florine. Aluminum Flouride is a colorless solid used in the production of aluminum and phosphorus trifluoride is a poisonous colourless gass.

2,1 Define the term covalent bond in words
2,2 Write down the type of chemical bond between the atoms in
2,2,1 ALF3
2,2,2 PF3
2,3 Drwa the lewis structure for
2,3,1 CH4
2,4 Write the molecules shape of CH4

2,1 The term covalent bond refers to a chemical bond formed between two atoms by the sharing of electrons.

2,2
2,2,1 The chemical bond between the atoms in ALF3 is an ionic bond.
2,2,2 The chemical bond between the atoms in PF3 is a covalent bond.

2,3
2,3,1 The Lewis structure for CH4, or methane, is as follows:

H
|
H - C - H
|
H

2,4 The molecule shape of CH4 is tetrahedral.