Question

If M2+ is radioactive with a-emission, then the correct order of radioactivity of following substances is: (1) 1 g Mo (II) 1 g MSO (III) 19 MCL (IV) 1 g MS (1) | > || > III > IV (2) IV > III > | > 1 (3) | > IV > III > 11 (4) > IV > || > III​

Answer 1

Answer:

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(3) | > IV > III > 11

Answer 2

Explanation:

An alpha particle is a helium nucleus 42He. Whenever a nucleus goes through alpha decay, it transforms into a different nucleus by emitting an alpha particle. For example, when 23892U undergoes alpha-decay, it transforms into 23490Th.

23892U → 23490Th + 42He … (1)

Now, 42He contains two protons and two neutrons. Hence, after emission, the mass number of the emitting nucleus reduces by four and the atomic number reduces by two. Therefore, the transformation of AZX nucleus to A-4Z-2X nucleus is expressed as follows,

AZX → A-4Z-2X + 42He … (2)