Is 10^5ns greater than 10^2ms

How will the emission of an alpha particle affect the atomic number of an atom

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

What is the ph of a 0.0010 m hno3? 1.0 3.0 4.0 5.0