To find the number of neutrons in an atom, you would subtract a. mass number from atomic number b. atomic number from mass number c. atomic number from electron number b. isotope number from atomic number

a.   mass number from atomic number

the higher the current the higher the mag field around it the higher the influence on the compass

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.