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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The last unknown element between bismuth and uranium was discovered by Lise Meitner (1878-1968) and Otto Hahn (1879-1968) in 1918. They obtained 231Pa by chemical extraction of pitchblende, in which its concentration is about 1 ppm (pan per million). This isotope, an α emitter, has a half-life of 3.27 × 104 years.

(a) Which radioactive decay series (the uranium-235, uranium-238, or thorium-232 series) contains 231Pa as a member?

(b) Suggest a possible sequence of nuclear reactions starting with the long-lived isotope that eventually forms this isotope.

(c) What quantity of ore would be required to isolate 1.0 g of 231Pa, assuming 100% yield?

(d) Write an equation for the radioactive decay process for 231Pa.

(a)

Interpretation Introduction

Interpretation:

The radioactive decay series that contains Pa-231 as a member has to be identified.

Concept-introduction:

Radioactive decay series: Any of four independent sets of unstable heavy atomic nuclei that decay through a series of alpha and beta decays until a stable nucleus is achieved.

Explanation

       Fig.1

P

(b)

Interpretation Introduction

Interpretation:

A possible sequence of nuclear reaction starting with long-lived isotope that eventually forms this isotope has to be suggested.

(c)

Interpretation Introduction

Interpretation:

The radioactive decay series that contains Pa-231 as a member has to be identified.

Concept-introduction:

Radioactive decay series: Any of four independent sets of unstable heavy atomic nuclei that decay through a series of alpha and beta decays until a stable nucleus is achieved.

(d)

Interpretation Introduction

Interpretation:

The radioactive decay series that contains Pa-231 as a member has to be identified.

Concept-introduction:

Radioactive decay series: Any of four independent sets of unstable heavy atomic nuclei that decay through a series of alpha and beta decays until a stable nucleus is achieved.

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