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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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By how many units does the mass number of a nucleus change when the nucleus produces an alpha particle? By how many units does the mass number of a nucleus change when the nucleus produces a beta particle? Is each change an increase or decrease in mass number?

Interpretation Introduction

Interpretation:

The units by which the mass number of a nucleus changes when it produces an alpha particle and when it produces beta particle should be determined. Interpret the change whether the mass number changes is increases or decreases.

Concept Introduction:

The number of proton of the nuclide is equal to its atomic number and mass number is the sum of number of proton and neutron. The number of neutron is equal to the difference between the mass number to the number of proton.

Explanation

The decay of the alpha particle, when mass number gets decreases by 4 and atomic number decreases by 2. For example:

23492U23090Th +42He

The atomic mass of U decreases by 4 that is 234 to 230 and its atomic number is decreases by 2 that is from 92 to 90 results in formation of Th.

Beta decay is the decay in which atomic number increases by 1 and no change in the mass number

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