Questions

CF4 is tetrahedral.

Since the four 'F' atoms have the same electronegativity values, there is no bias in electron distribution toward any one.

Therefore, electron/charge distribution is symmetrical, which also means that the molecule is nonpolar.

Hence, CF4 is nonpolar molecule with a symmetrical distribution of charge.

The Rolling plan refers to one-year plans in the five-year perspective. under Rolling plan, there would be an annual appraisal of the progress of the plan and on the basis of such an appraisal, the plan for the next year will be prepared. The plan would go on rolling year after year.

In word, the mailing list is known as the Data source.