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In-s [12.5K]
3 years ago
12

An atom has a mass number of 24 and 13 neutrons. what is the atomic number of this atom?

Chemistry
1 answer:
Elodia [21]3 years ago
3 0
do ityou times 24×13=312.
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How much of a 400g sample remains after 4 years if a radioactive isotope has a half-life of 2 years?
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Answer:

100 g

Explanation:

From the question given above, the following data were obtained:

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Next, we shall determine the number of half-lives that has elapse. This can be obtained as follow:

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N = 0.25 × 400

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