Why is it that when atoms get closer together the space between the nuclei are held apart? ! i have a packet to turn in tomorrow and i don't know the answer.

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.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins. co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)