Solve the each part of given problem:
Problem: Two identical metal spheres A and B are in contact. Both are initially neutral. 1.0×1012 electrons are added to sphere A, then the two spheres are separated.
Part A: Afterward, what is the charge of sphere A?
Part B: Afterward, what is the charge of sphere B?
I need help to solve the above question and express your answer to two significant figures and include the appropriate units.