3.Molecules of methane, CH4, and carbon tetrachloride, CCl4, have bond angles of 109.5 degrees, do they have a molecular geometry shape.

Tetrahedral

Explanation:

A molecule is tetrahedral if it has a bond angle of 109.5 degrees.

Recall that the valence shell electron pair repulsion theory states that electron pairs on the outermost shell of the central atom in a molecule tend to position themselves as far apart in space as possible.

Hence, when there are four electron domains on the four electron pair position themselves at the corners of a perfect tetrahedron at a  bond angle of 109.5 degrees as long as there are no lone pairs present.

the atomic mass is the bottom number on the element.

-steel jelly