ASAP need help with this problems plss and thank you

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

How do scientists think that gravity affected the formation of our solar system?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive