Some chlorine atoms have an atomic mass of 37, while others have an atomic mass of 35. What is the difference between the two types of chlorine
atom?
A. The number of protons
B. The number of neutrons
C. The number of electrons
D. The number of ions

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.