Asample of francium-212 will decay to one sixteenth of its original amount after 80 minutes. what is the half-life of francium-212.

20 minutes.

The sample would lose one half the quantity of francium in each half-life.

Thus a mass decrease by a factor of 16 would correspond to a period of four half-lives. It took 80 minutes for the sample to lose all these francium, therefore

minutes.

at the bottom

explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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