1.Which of the following has a positive charge?

a.proton

b.neutron

c.anion

d.electron

e.atom

2.Rutherford carried out experiments in which a beam of alpha particles was directed at a thin piece of metal foil. From these experiments he concluded that:

a.electrons are massive particles.

b.the positively charged parts of atoms are moving about with a velocity approaching the speed of light.

c.the positively charged parts of atoms are extremely small and extremely heavy particles.

d.the diameter of an electron is approximately equal to that of the nucleus.

e.electrons travel in circular orbits around the nucleus

3.Consider the species 72Zn, 75As and 74Ge. These species have:

a.the same number of electrons.

b.the same number of protons.

c.the same number of neutrons.

d.the same number of protons and neutrons.

e.the same number of protons and neutrons

4.Which of the responses contains all the statements that are consistent with the Bohr theory of the atom (and no others)?

a.An electron can remain in a particular orbit as long as it continually absorbs radiation of a definite frequency.

b.The lowest energy orbits are those closest to the nucleus.

c.An electron can jump from the K shell (n = 1 major energy level) to the M shell (n = 3 major energy level) by emitting radiation of a definite frequency.

d.1,2,3

e.2 only

f.3 only

g.1,2

h.2,3