What is the mass number for an atom of zinc containing 30 protons and 34 neutrons?

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

What four properties do all waves have in common

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.