Its a 50% chance that approx 1/2 of the pennies will land on tails. The next toss will result the same. and so on and so on. showing how a reaction would slowly eliminate 1/2 of the remaining lives per reaction, until nothing is left. I think it is a good stimulation.
add up the mass of protons and neutrons
Well, I say the answer is Thermosphere! Hope I helped :)
Answer:
The mass number
Explanation:
The mass number of an atom is its total number of protons and neutrons.
I hope this helps a bit.
The Photo Isn't Clear At All.