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1. chem.libretexts.org › 33.4: Atomic Mass and Atomic Number - Chemistry LibreTexts

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   26 cze 2023 · The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table.

   • Subatomic Particles

     This subatomic's mass is not represented in the decimal mass...

   • 3.E

     The atomic number defines the identity of an element. In an...

   • Isotopes

     This statement is true. Aluminum with a mass of 27 is...

   • Elizabeth Gordon

     Elizabeth Gordon - 3.4: Atomic Mass and Atomic Number -...

   • Atomic Mass

     Atomic Mass - 3.4: Atomic Mass and Atomic Number - Chemistry...

   • Atomic Number

     Atomic Number - 3.4: Atomic Mass and Atomic Number -...

   • 4.17: Mass Number

     The mass number is defined as the total number of protons...

2. en.wikipedia.org › wiki › Mass_numberMass number - Wikipedia

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   The mass number (symbol A, from the German word: Atomgewicht, "atomic weight"), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

3. ptable.comPeriodic Table - Ptable

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   For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.

4. www.khanacademy.org › a › atomic-number-atomic-mass-and-isotopes-articleAtomic number, atomic mass, and isotopes - Khan Academy

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   Learn how to calculate the mass number and atomic mass of atoms, and how isotopes differ in their number of neutrons and stability. Find out how radioactive decay and carbon-14 dating work.

5. chem.libretexts.org › Bookshelves › Introductory_Chemistry4.17: Mass Number - Chemistry LibreTexts

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   The mass number is defined as the total number of protons and neutrons in an atom. It can be calculated by adding the number of neutrons and the number of protons (atomic number) together. Mass number = atomic number + number of neutrons. Consider Table \(\PageIndex{1}\) below that shows data from the first six elements of the periodic table.

6. www.khanacademy.org › v › atomic-number-mass-number-and-isotopesAtomic number, mass number, and isotopes (video) | Khan Academy

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   The mass number is the combined number of protons and neutrons in a nucleus, so it's protons and neutrons, and it's symbolized by A. So A is the mass number, which is equal to the number of protons, that's the atomic number which we symbolized by Z, plus the number of neutrons.

7. chem.libretexts.org › 22.2: Atomic Number, Mass Number, and Atomic Mass Unit

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   Refer to the periodic table and use the number of protons to identify the element. Calculate the mass number of each isotope by adding together the numbers of protons and neutrons. Give the symbol of each isotope with the mass number as the superscript and the number of protons as the subscript, both written to the left of the symbol of the ...