• Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element.It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons.. The sum of the atomic number Z and the number of neutrons ...
  • 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.
  • Atomic number | Definition of Atomic number at Dictionary.com

    www.dictionary.com/browse/atomic-number Atomic number definition, the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus. Abbreviation: at. no.; Symbol: Z See more.
  • What Is the Atomic Number? Definition and Importance

    www.thoughtco.com/what-is-the-atomic-number-4031221 The atomic number of carbon is 6. More commonly, the isotope symbol already tells you the atomic number. For example, if the symbol is written as 14 6 C, the number "6" is listed. The atomic number is the smaller of the two numbers in the symbol. It is typically located as a subscript to the left of the element symbol.
  • Atomic Number | Definition of Atomic Number by Merriam-Webster

    www.merriam-webster.com/dictionary/atomic%20number Atomic number definition is - an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table.
  • Atomic number, atomic mass, and isotopes (article) | Khan ...

    www.khanacademy.org/science/.../atomic-number-atomic-mass-and-isotopes-article The atomic number is the number of protons in an atom, and isotopes have the same atomic number but differ in the number of neutrons. If you're seeing this message, it means we're having trouble loading external resources on our website. If you're behind a web filter, ...
  • Atomic Number and Mass Number - nde-ed.org

    www.nde-ed.org/EducationResources/HighSchool/.../atomicmassnumber.htm What is an atom's atomic number? The number of protons in the nucleus of an atom determines an element's atomic number. In other words, each element has a unique number that identifies how many protons are in one atom of that element. For example, all hydrogen atoms, and only hydrogen atoms, contain one proton and have an atomic number of 1.
  • Element List - Atomic Number, Element Name and Symbol

    www.thoughtco.com/element-list-names-atomic-numbers-606529 Here's a list of the chemical elements ordered by increasing atomic number.The names and element symbols are provided. Each element has a one- or two-letter symbol, which is an abbreviated form of its present or former name.The element number is its atomic number, which is the number of protons in each of its atoms.
  • Atomic number, mass number, and isotopes (video) | Khan ...

    www.khanacademy.org/science/.../atomic-number-mass-number-and-isotopes The atomic number doesn't change when you're talking about an isotope. If you change the atomic number, you change the element. So there's still six protons in the nucleus of this atom and in a neutral atom, there must be the equal number of electrons.
  • atom | Definition, History, & Examples | Britannica

    www.britannica.com/science/atom Atomic number. The single most important characteristic of an atom is its atomic number (usually denoted by the letter Z), which is defined as the number of units of positive charge (protons) in the nucleus. For example, if an atom has a Z of 6, it is carbon, while a Z of 92 corresponds to uranium. A neutral atom has an equal number of protons ...