Avogadro's Number: 6.022xx10^(23) An atom of ..^(238)U disontegates by a series of alpha-decays and beta-decays until it becomes .^(206)Pb, which is stable. (i) How many alpha-decays and many beta-decays does an atom starting as ..^(238)U undergo before it becomes stable? (ii) One of the following ten nuclides is formed from a series of disintegrations starting at ..^(238)U. Which one? .^(235)U, .^(234)U, .^(228)Ac, .^(224)Ra, .^(224)Rn, .^(220)Rn, .^(215)Po, .^(212)Po, .^(212)Pb, .^(211)Pb.

Avogadro's Number: 6.022xx10^(23) An atom of ..^(238)U disontegates b

1.	Avogadro's Number: 6.022xx10^(23) An atom of ..^(238)U disontegates by a series of alpha-decays and beta-decays until it becomes .^(206)Pb, which is stable. (i) How many alpha-decays and many beta-decays does an atom starting as ..^(238)U undergo before it becomes stable? (ii) One of the following ten nuclides is formed from a series of disintegrations starting at ..^(238)U. Which one? .^(235)U, .^(234)U, .^(228)Ac, .^(224)Ra, .^(224)Rn, .^(220)Rn, .^(215)Po, .^(212)Po, .^(212)Pb, .^(211)Pb.
Answer» Answer :(i) `8 ALPHA's` and `6 BETA^(-)'` (only `alpha's` gives `^(206)Os`, to come from Os to Pb requires `6 beta^(-)' s`) (II) `^(234)U`, all other answer are incorrect.