A) x-rays can not pass through bone.
B) x-rays pass through bone.
C) x-rays react with bone.
D) bones are less dense than soft tissue.

A) electrons.
B) neutrons.
C) photons.
D) protons.
E) neutrinos.

A) Chlorine has an atomic number of 18.
B) Chlorine atoms have 18 electrons.
C) Chlorine has an atomic number of 35.
D) Chlorine has 35 electrons.
E) Chlorine has a mass number of 35.