Which of the following isotopes is most useful for dating plant and animal remains? a. potassium- 40 b. uranium- 238 c. carbon-14 d. lead-212

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

What produces wave a)sound b) heats c)transfer of energy d)vibrations

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.