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Physics

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?

Radioactivity

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Answer

(a) ZAX Z2A4X1+24He  Z1A4X2+ 10 ZA4Y+ 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.

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