Marie Curie discovered polonium and radium. Hope this helps:))) Please, mark Brainliest!
They are in order according to their atomic number, so the position should tell you the atomic number.
Answer:
The third one makes the most sense
When you have the bottom measurement of the triangle (base) and the height of the triangle in the center, you multiply them together and then divide by 2.
~Do you need more explaining~?
The charge of a proton is positive.
