What types of atomic orbitals are in the third principal energy level?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

How many neutrons does plutonium -196 with an atomic number of 78.