英语翻译1 if a radioactive sample with a half-life of 40 years d
英语翻译
1 if a radioactive sample with a half-life of 40 years decays for 80 years,25% of the original sample will remain.
2 electrons are located in orbitals,not orbits
1 if a radioactive sample with a half-life of 40 years decays for 80 years,25% of the original sample will remain.
2 electrons are located in orbitals,not orbits
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