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

Certain types of organisms such as fireflies and anglerfish can produce light through chemical reactions in a process called bioluminescence. what kind of chemical reactions occur during bioluminescence? o a) exothermic ob) endothermic oc) recomposition od) decomposition