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ICSE Class 10 Physics Question 22 of 25

Solved 2025 Specimen Paper ICSE Class 10 Physics — Question 14

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Question

Question 8(ii)

A radioactive nucleus X emits an alpha particle followed by two beta particles to form nucleus Y.

(a) With respect to the element X, where would you position the element Y in the periodic table?

(b) What is the general name of the elements X and Y?

(c) If the atomic number of Y is 80 then what is the atomic number of X?

Answer

(a) ZAX⟶Z−2A−4X1+24He ⟶Z−1A−4X2+−10e ⟶ZA−4Y+−10e_{\text Z}^{\text A}\text{X} \longrightarrow \\ _{\text Z-2}^{\text A - 4}\text{X}_1 + _{2}^{4}\text{He}\ \longrightarrow \\ _{\text Z-1}^{\text A - 4}\text{X}_2 + \\ _{-1}^{0}\text{e}\ \longrightarrow \\ _{\text Z}^{\text A - 4}\text{Y} + \\ _{-1}^{0}\text{e}

We can see from the above that X and Y have same atomic number. Hence, X and Y will occupy the same position in the periodic table

(b) Isotope.

(c) When the atomic number of Y is 80 and X and Y are isotopes then atomic number of X will also be 80.