Ch.2 - Atoms, Molecules, and Ions

Brown - Chemistry: The Central Science 14th Edition

Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo

Brown 14th Edition

Ch.2 - Atoms, Molecules, and Ions

Problema 30a

Capitolo 2, Problema 30a

Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol ¹¹²Cd
Protons 38 92
Neutrons 58 49
Electrons 38 36
Mass no. 81 235
Complete the first row of the table.

Guida verificata passo dopo passo

Identify the number of protons in the given isotope of cadmium, \( ^{112}\text{Cd} \). The atomic number of cadmium (Cd) is 48, which means it has 48 protons.

Determine the number of neutrons in \( ^{112}\text{Cd} \) by using the mass number formula: \( \text{Mass number} = \text{Protons} + \text{Neutrons} \). Here, the mass number is 112, so solve for neutrons: \( 112 = 48 + \text{Neutrons} \).

Calculate the number of electrons in a neutral atom of \( ^{112}\text{Cd} \). In a neutral atom, the number of electrons equals the number of protons, so there are 48 electrons.

Verify the mass number for \( ^{112}\text{Cd} \) using the formula: \( \text{Mass number} = \text{Protons} + \text{Neutrons} \). Ensure it matches the given mass number of 112.

Fill in the table with the calculated values: Protons = 48, Neutrons = 64, Electrons = 48, Mass number = 112.

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Atomic Structure

Atoms consist of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, while neutrons are neutral particles also located in the nucleus. Electrons are negatively charged and orbit the nucleus. The number of protons defines the element, while the total number of protons and neutrons gives the atomic mass.

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Percorso guidato

02:10

Atom Structure

Isotopes

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This results in different atomic masses for the isotopes of the same element. For example, Cadmium (Cd) can have isotopes with varying neutron counts, affecting its stability and abundance.

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04:36

Isotopes

Mass Number

The mass number of an atom is the total count of protons and neutrons in its nucleus. It is represented as a superscript to the left of the element's symbol. For instance, in the notation 112Cd, the mass number is 112, indicating that the sum of protons and neutrons in this isotope of Cadmium is 112.

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02:19

Atomic Mass

Pratica correlata

Domanda del libro di testo

Fill in the gaps in the following table, assuming each column represents a neutral atom.

Symbol ¹¹²Cd

Protons 38 92

Neutrons 58 49

Electrons 38 36

Mass no. 81 235

Complete the second row of the table.

1238

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Domanda del libro di testo

Fill in the gaps in the following table, assuming each column represents a neutral atom.

Symbol ⁷⁹Br

Protons 25 82

Neutrons 30 64

Electrons 48 86

Mass no. 222 207

Complete the fifth row of the table.

396

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Domanda del libro di testo

Write the correct symbol, with both superscript and subscript, for each of the following. Use the list of elements in the front inside cover as needed: (a) the isotope of platinum that contains 118 neutrons

816

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Domanda del libro di testo

Fill in the gaps in the following table, assuming each column represents a neutral atom.

Symbol ⁷⁹Br

Protons 25 82

Neutrons 30 64

Electrons 48 86

Mass no. 222 207

Complete the fourth row of the table.

446

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