The amount of material left after two half-lives is one-half of the original amount.

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That statement is false. When an atom gains or loses electrons, the charged particle that results is called a molecule. The amount of material left after two half-lives is one-half of the original amount. Fission is the combining of two low-mass nuclei into one nucleus with a larger mass. I got that part from google for a more detailed response.

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can you attach a picture of the lettuce? : )

може ли да зареждате повече информация, моля