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The nucleus ¹¹⁵₄₈Cd, after two successive β-decay will give

Asked in CBSE AIPMT 1988 · Q-value, decay and conservation laws

• (1) ¹¹⁵₄₆Pa
• (2) ¹¹⁴₄₉In
• (3) ¹¹³₅₀Sn
• (4) ¹¹⁵₅₀Sn

Step-by-step solution

Why the other options are wrong

• (1) comes from lowers the atomic number by 2 at an unchanged mass number, which is what two positron emissions would do; an α emission would also have dropped A by 4.
• (2) comes from raises the atomic number by only 1 and drops a nucleon as well.
• (3) comes from has the right atomic number but loses two nucleons, which β decay does not do.

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