A typical ream of paper contains 500 sheets, is 4.85 cm thick, weighs 1.56 kg, and costs $7.50. 1
How many sheets would there be in a stack of paper as tall as the St. Louis Arch (192 m)?

4- c, because all matter stays the same no matter what. it is still there. 5- b, because matter is known as mass. 6-c because, flammability is a chemical property. malleability is changing the shape of an object.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.