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  2. What Is an Atomic Number? Definition and Examples - Science Notes...

    sciencenotes.org/what-is-an-atomic-number-definition-and-examples

    The atomic number is the number of protons in the nucleus of an atom, which uniquely identifies its element. Learn how to find the atomic number, the importance of the atomic number, and the list of all 118 atomic numbers and symbols.

  3. Atomic number | Definition & Facts | Britannica

    www.britannica.com/science/atomic-number

    Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in a neutral atom, is also the atomic number.

  4. Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number

    Atomic number is the number of protons in the atomic nucleus of an element. It can be used to identify and order elements in the periodic table, and it is related to the chemical and physical properties of atoms.

  5. What Is the Atomic Number? Definition and Importance - ThoughtCo

    www.thoughtco.com/what-is-the-atomic-number-4031221

    The atomic number is the number of protons in an atom and how you identify an element. Learn how to find it, why it matters, and how it relates to the periodic table and isotopes.

  6. Atomic Number Definition - Chemistry Glossary - ThoughtCo

    www.thoughtco.com/definition-of-atomic-number-604376

    The atomic number of a chemical element is the number of protons in the nucleus of an atom of the element. It is the charge number of the nucleus since neutrons carry no net electrical charge. The atomic number determines the identity of an element and many of its chemical properties.

  7. 3.4: Atomic Mass and Atomic Number - Chemistry LibreTexts

    chem.libretexts.org/.../3.04:_Atomic_Mass_and_Atomic_Number

    Learn what atomic number is and how to use it to identify elements. Find out how to calculate the number of protons, neutrons, and electrons in an atom using atomic number and mass number.

  8. 4.16: Atomic Number - Chemistry LibreTexts

    chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry...

    The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. Learn how the periodic table is arranged by atomic number and why it is important for understanding the properties of atoms.

  9. atomic number, Number of a chemical element in the systematic, ordered sequence shown in the periodic table. The elements are arranged in order of increasing number of protons in the nucleus of the atom (the same as the number of electrons in the neutral atom), and that number for each element is its atomic number.

  10. 4.5: Chemical Symbols and the Atomic Number - Chemistry...

    chem.libretexts.org/Courses/Anoka-Ramsey_Community_College/Introduction_to...

    The atomic number is the number of protons in the nucleus of an atom of an element. It also indicates the number of electrons in a neutral atom of that element. Learn how to use atomic number to identify elements and their properties.

  11. Atomic Number - Chemistry - Socratic

    socratic.org/chemistry/a-first-introduction-to-matter/atomic-number

    Learn the definition, properties, and applications of atomic number, the number of protons in the nucleus of an atom. Find examples, practice problems, and explanations of how atomic number relates to electron configuration, isotopes, and periodic table.