Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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# The Radioactive Isotope D Decays According to the Sequenceif the Mass Number and Atomic Number of D2 Are 176 and 71 Respectively, What is (I) the Mass Number (Ii) Atomic Number of D? - Physics

#### Question

The radioactive isotope D decays according to the sequence

If the mass number and atomic number of D2 are 176 and 71 respectively, what is (i) the mass number (ii) atomic number of D?

#### Solution

An alpha (α) particle is a helium nucleus (""_2^4He)and a beta-minus decay (β) is an emission of an electron.

The substance D2 can be represented as ""_71^176D_2.

Hence,

(i) The mass number of D is 180.

(ii) The atomic number of is 72.

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