Write nuclear reaction equations for each of the following: a. Beta-decay in Bk-

Question

Write nuclear reaction equations for each of the following: a. Beta-decay in Bk-249 b. Electron-capture in I-111 c. Positron-emission in K-40 d. Alpha-decay to produce At-217 2. Use a plot of Neutrons vs. Protons to determine which of the following would be stable nuclides? a. Mg-26 b. Ne-25 c. Co-51 d. Te-124 3. Use a plot of Neutrons vs. Protons to predict which type of decay is more likely (beta-decay, positron emission or alpha-decay) for each of the following: a. Mo-109 b. Ru-90 c. P-27 d. Rn-196 e. Sb-132 f. Te-139 g. Fr-202 h. Ba-123 4. Write a partial decay series for the following: a. Th-232 undergoing sequentially alpha, beta, beta, alpha b. Rn-220 undergoing sequentially alpha, alpha, beta, alpha

Explanation / Answer

2.

Explanation

Accordingly ,

The stable nuclei are -

.................a. 12 Mg-26 .........with n/ p = (14/12 ) = 1.16

.................... 10Ne- 25 ............................= ( 15/10 ) = 1.5

.......................52Te - 124   ........................= (72 /52) = 1.38

Note : in case of 27 Co- 51 n/ p is < 1 ( ie = 24/ 27 ) = 0.88 , hence it cannot be regarded as a stable nuclei.

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3.

Explanation

A plot of Neutrons vs. protons is used to predict the type of decay which is more likely to occur. It is inferred as following,

Accordingly ,

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