To which group of the periodic table does the last member of the following series belong-a 92 239 U 93 239 Np 94 239 Pub 55 140 Cs 56 140 Ba 57 140 La 58 140 Cec 88 226 Ra 86 222 Rn 84 218 Po

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Uses of Radioactive Substances

To which grou...

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To which group of the periodic table does the last member of the following series belong?
(a) $_{92}^{239} U {- β - ---- \to}_{93}^{239} N p {- β - ---- \to}_{94}^{239} P u$
(b) $_{55}^{140} C s {- β - ---- \to}_{56}^{140} B a {- β - ---- \to}_{57}^{140} L a {- β - ---- \to}_{58}^{140} C e$
(c) $_{88}^{226} R a {- α - ---- \to}_{86}^{222} R n {- α - ---- \to}_{84}^{218} P o$

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