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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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. Which of the following statement(s) is(are)true?

a. A radioactive nuclide that decays from 1.00 × 10 10 atoms to 2.5 × 10 9 atoms in 10 minutes has a half-life of 5.0 minutes.

b. Nuclides with large Z values are observed to be a-particle producers.

c. As Z increases, nuclides need a greater proton-to-neutron ratio for stability.

d. Those light” nuclides that have twice as many neutrons as protons are expected to be stable.

Interpretation Introduction

Interpretation:

The correct statements should be determined and explained.

Concept Introduction:

The decaying of an atom takes place by three types of decay such as alpha decay, beta decay, gamma decay.

In alpha decay, an alpha particle with mass 4m and electron 2e is removed from nuclide while in beta decay two types of decay are possible beta (+) and beta (-). In gamma decay, nuclide will remain same as the original one.

Explanation

Reason for correct statement.

For statement (a).

  ( N /N o ) =  ( 1/2 ) t /t h ( 2.5× 10 9 /10 10 ) =  ( 1/2 ) 10 /t h

2 = 10 /th

th = 5 min

Thus, the statement (a) is true

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