Isotopes of the same element have different
a. positions on the periodic table.
b. atomic numbers.
c. mass numbers.
d. elemental symbols
user: one mole of copper equals how many atoms?
a. 0.166 atoms
b. 6.02 atoms
c. 6.02 ×1023 atoms
d. 1.66 ×10-22 atoms

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this