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1. • Total number of protons and neutrons

     • The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers, but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.
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     Atomic number and mass number - Atomic structure - AQA - BBC

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   What is the mass number of an atom?

   • The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers close mass numberThe number of protons and neutrons found in the nucleus of an atom., but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

   Atomic structure - AQA Atomic number and mass number - BBC

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   What is the atomic number of an atom?

   • An atom consists of a nucleus containing protons and neutrons, surrounded by electrons.is called its atomic number: the atoms of a particular elementcloseelementA substance made of one type of atom only.all have the same number of protons the atoms of different elements have different numbers of protons

   The atom Atomic number and mass number - BBC

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   What is the difference between mass number and atomic number?

   • The mass number is different for each isotope of a given chemical element, and the difference between the mass number and the atomic number Z gives the number of neutrons (N) in the nucleus: N = A − Z. [ 2 ] The mass number is written either after the element name or as a superscript to the left of an element's symbol.

   Mass number - Wikipedia

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   What does mass number mean in chemistry?

   • In chemistry, the mass number indicates that: "the mass number of an atom is the sum of the number of protons and neutrons in the atomic nucleus." In this case, the number of electrons around the nucleus is not considered. Neutrons and protons are the two subatomic particles that make up the nucleus of an atom.

   What is the mass number of an atom? formula and definition - Nuclear …

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   How do you find the mass number of an atom?

   • The mass number of an atom is the sum of the number of protons and neutrons in the nucleus. The easiest way to find the mass number of an atom is to look at the periodic table. The mass number is listed above the symbol for each element. For example, the mass number of carbon is 12, and the mass number of oxygen is 16.

   What is the mass number of an atom? formula and definition - Nuclear …

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   How do you calculate the mass number of a neutron atom?

   • Knowing that neutrons have no electrical charge, a neutral atom implies that it has the same number of protons as electrons. The value of the mass number can be calculated with the following formula: Mass number (A) = atomic number (Z) + number of neutrons (N). Increasing the atomic number, the mass number increases.

   What is the mass number of an atom? formula and definition - Nuclear …

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3. www.bbc.co.uk › bitesize › guidesAtomic structure - AQA Atomic number and mass number - BBC

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   The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different. mass numbers. , but they can be the same. For example, the...

   • Calculating Relative Atomic Mass

     It is the number of times heavier an atom is than...

   • Mass number

     The mass number of an element tells us the number of protons...

4. www.bbc.co.uk › bitesize › guidesThe atom Atomic number and mass number - BBC

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   in an atom is called its mass number. The atomic number is shown below the chemical symbol, and the mass number is shown above. In this example the atomic number is 17 and the mass...

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

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   The mass number (A) is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom in atomic mass units. Learn how to write, calculate and compare mass numbers and isotopic masses.

6. Videos

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     Atomic Number & Mass Number | Properties of Matter | Chemistry | FuseSchool

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     Atomic Number, Mass Number, and Net Electric Charge

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     Understanding Atomic Number and Atomic Mass

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7. chem.libretexts.org › Courses › Furman_University3.4: Atomic Mass and Atomic Number - Chemistry LibreTexts

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   Jun 26, 2023 · Learn how to define and calculate the atomic mass and atomic number of an atom based on its subatomic particles. The web page also explains the charge and relative mass of protons, neutrons, and electrons.

8. chem.libretexts.org › Courses › University_of2.2: Atomic Number, Mass Number, and Atomic Mass Unit

   chem.libretexts.org › Courses › University_of

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   Learn the definitions and properties of atomic number, mass number, and atomic mass unit, and how to convert between them. Find out how isotopes and isotopic distributions affect the mass of elements.

9. www.bbc.co.uk › bitesize › guidesMass number - Atomic structure and properties relating to ...

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   The mass number of an element tells us the number of protons AND. neutrons. in an atom (i.e. the two particles that have a measureable mass). Sodium has a mass number of 23amu. Since...

10. nuclear-energy.net › atom › mass-numberWhat is the mass number of an atom? the formula and definition

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    Feb 27, 2020 · The mass number of an atom is the sum of the number of protons and neutrons in the nucleus. The easiest way to find the mass number of an atom is to look at the periodic table. The mass number is listed above the symbol for each element.