Why are electrons held into the nucleus?

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.