Will a marble keep rolling forever on a flat hardwood floor?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out