What is atomic mass? How is it calculated?

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Problem 24E Chapter 2

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 24E

What is atomic mass? How is it calculated?

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Solution : Here, we are asked to find the differences in the compositions of the given pairs of atomic nuclei. An atom is composed of three main subatomic particles namely protons, neutrons and electrons. The subatomic particles of an atom gives the element's atomic number and mass number. The number of protons in the n ucleus of an atom determines an element's atomic number. The sum of p rotons and neutrons give the atom’s ma ss number. Let’s consider a c arbon atom. C arbon atom with its m ass number and atom number can be represented as : Now, let’s look at the pairs given to find the difference in the composition of the nuclei : : Consider, atom : Bi is the chemical symbol of Bismuth. Bi has an atomic number of 83 and mass number of 210 as shown. Atomic number of 83 indicates, there are 83 protons and 83 electrons. Now we determine the number of neutrons. Number of neutrons = mass number - number of protons = 210-83 = 127. Consider, atom : Pb is the chemical symbol of Lead. Pb has an atomic number of 82 and mass number of 210. Therefore, number of protons = 82 Number of e lectrons = 2 Number of n eutrons = mass number - number of protons = 210 - 82 = 128. These show the composition of nuclei of both the atoms. A pair of atoms are said to b e sotope hen they have s ame atomic number but different mass number. Thoug h both atoms in the pair have same mass number, they have different atomic numbers and hence they are not Isotopes. : N is the chemical symbol of Nitrogen. N has an atomic number of 7. Both the atoms in the pair belong to N element. Let’s consider atom, in the...

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Chapter 2, Problem 24E is Solved
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Textbook: Chemistry: A Molecular Approach
Edition: 3rd
Author: Nivaldo J. Tro
ISBN: 9780321809247

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What is atomic mass? How is it calculated?

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