Write isotopic symbols in the form X-A (e.g., C-13) for each isotope. b. the gold isotope with 119 neutrons

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Identify the element symbol for gold, which is 'Au'.

Determine the atomic number of gold, which is 79. This represents the number of protons in the nucleus.

Use the given number of neutrons, which is 119, to find the mass number. The mass number is the sum of protons and neutrons: Mass number = 79 (protons) + 119 (neutrons).

Combine the element symbol and the mass number to write the isotopic symbol in the form X-A.

The isotopic symbol for the gold isotope with 119 neutrons is Au-(mass number).

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주요 개념

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Isotopes

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This difference in neutron count results in varying atomic masses for the isotopes of the same element. For example, carbon has isotopes like carbon-12 and carbon-14, which differ in their neutron numbers.

Isotopic Notation

Isotopic notation is a way to represent isotopes using the format X-A, where 'X' is the chemical symbol of the element and 'A' is the mass number, which is the sum of protons and neutrons. For instance, in C-13, 'C' represents carbon and '13' is the mass number indicating it has 6 protons and 7 neutrons.

Mass Number

The mass number of an isotope is the total count of protons and neutrons in its nucleus. It is crucial for identifying isotopes and understanding their stability and behavior in chemical reactions. For example, if a gold isotope has 119 neutrons, and knowing gold has 79 protons, its mass number would be 198 (79 protons + 119 neutrons), represented as Au-198.