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Ch.2 - Atoms & Elements
Tro - Chemistry: A Molecular Approach 4th Edition
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Capitolo 2, Problema 51d

Write isotopic symbols in the form X-A (e.g., C-13) for each isotope. d. the hydrogen isotope with one neutron

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Identify the element of the isotope mentioned in the problem. In this case, the element is hydrogen.
Recall that the isotopic symbol is generally written in the form X-A, where X is the chemical symbol of the element and A is the mass number (sum of protons and neutrons).
Determine the number of protons in hydrogen. Hydrogen always has 1 proton.
Add the number of neutrons given in the problem to the number of protons to find the mass number. For this isotope, hydrogen has 1 neutron.
Write the isotopic symbol using the information gathered: since hydrogen (symbol H) has 1 proton and 1 neutron, the mass number A is 2. Therefore, the isotopic symbol is H-2.

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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 C-12 and C-14, where the numbers indicate the total number of protons and neutrons.
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Isotopes

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 (the sum of protons and neutrons). For instance, in the notation H-2, 'H' represents hydrogen and '2' indicates that this isotope has one proton and one neutron, making it deuterium.
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Isotope Notation Example

Hydrogen Isotopes

Hydrogen has three primary isotopes: protium (H-1), deuterium (H-2), and tritium (H-3). Protium has no neutrons, deuterium has one neutron, and tritium has two neutrons. The question specifically refers to deuterium, which is represented as H-2, indicating it has one neutron in addition to its single proton.
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Hydrogen Isotopes
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