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Determine the atomic number and mass number for each isotope.(a) the hydrogen isotope

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 91P Chapter 4

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 91P

Problem 91P

Determine the atomic number and mass number for each isotope.

(a) the hydrogen isotope with 2 neutrons

(b) the chromium isotope with 28 neutrons

(c) the calcium isotope with 22 neutrons

(d) the tantalum isotope with 109 neutrons

Step-by-Step Solution:
Step 1 of 3

Solution 91P

(a) the hydrogen isotope with 2 neutrons

Tritium

Deuterium is a hydrogen isotope consisting of one proton, one neutron and one electron. It has major applications in nuclear magnetic resonance studies.

Tritium is a hydrogen isotope consisting of one proton, two neutrons and one electron.

(b) the chromium isotope with 28 neutrons

Atoms of the element chromium (Cr) have an atomic number of 24 and a mass number of 52.

The isotopes of chromium range from 42 Cr to 67Cr. The primary decay mode before the most                        abundant stable isotope, 52Cr, is electron capture and the primary mode after is beta decay..Naturally occurring chromium (24Cr) is composed of four stable isotopes; 50Cr, 52Cr, 53Cr, and 54Cr with 52Cr being the most abundant (83.789% natural abundance).

(c) the calcium isotope with 22 neutrons

A calcium atom is found with a mass of 42. Therefore,there are 20 protons and 22 neutrons in its nucleus.Calcium (20Ca) has 24 isotopes, from 34Ca to 57Ca. There are five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca and 46Ca), plus one isotope (48Ca) with such a long half-life that for all practical purposes it can be considered stable. The most abundant isotope, 40Ca, as well as the rare 46Ca, are theoretically unstable on energetic grounds, but their decay has not been observed. Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 102,000 years.

(d) the tantalum isotope with 109 neutrons

Natural tantalum (73Ta) consists of two stable isotopes: 181Ta (99.988%) and 180m

Ta (0.012%).

Step 2 of 3

Chapter 4, Problem 91P is Solved
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Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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Determine the atomic number and mass number for each isotope.(a) the hydrogen isotope