Why does one electron in a potassium atom go into the fourth energy level instead of squeezing into the third energy level along with the eight already there?

It conforms what ever surface its in.

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 answer is probably c. xylem