100.g of iodine -123?
Answer:
Definition of half-life is how long it takes for half of the isotope to decay. It doesn't matter how much is in the original sample. Thus, with a given half life of 13.1 hours, starting with a 100g sample, 50g will be left after 13.1 hours, 25g left after 26.2 hours, and 12.5g left after 39.3 hours, and the amount keeps halving every 13.1 hours. It will never reach zero.
2 haldf lives = 1/(2^2) therefore 1/4 left after two half lives(26.2 hours). same applies for the next half life: 1/8th of original value remains.
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