which have different numbers of electrons ?

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https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article

https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:atomic-structure-and-electron-configuration/a/the-periodic-table-electron-shells-and-orbitals-article
The periodic table, electron shells, and orbitals – Khan Academy
As we will see below, the periodic table organizes elements in a way that reflects their number and pattern of electrons, which makes it useful for predicting the reactivity of an element: how likely it is to form bonds, and with which other elements. Electron shells and the Bohr model

https://chem.libretexts.org/Bookshelves/General_Chemistry/Map:_Structure_and_Properties_(Tro)/01:_Atoms/1.08:_Subatomic_Particles_-_Protons_Neutrons_and_Electrons

https://chem.libretexts.org/Bookshelves/General_Chemistry/Map:_Structure_and_Properties_(Tro)/01:_Atoms/1.08:_Subatomic_Particles_-_Protons_Neutrons_and_Electrons
1.8: Subatomic Particles – Protons, Neutrons, and Electrons
All isotopes of an element have the same number of protons and electrons, which means they exhibit the same chemistry. … Above are the three isotopes of Hydrogen. Each have the same number of protons, but have different numbers of neutrons in the nucleus. (CC BY-SA 3.0; Balajijagadesh via Wikipedia) In addition to (^{12}C), a typical sample …

https://chem.libretexts.org / Courses / can / CHEM_210_General_Chemistry_I_(Puenzo) / 02:_Atoms_and_Elements / 2.06:_Protons_Neutrons_and_Electrons_in_Atoms

https://chem.libretexts.org / Courses / can / CHEM_210_General_Chemistry_I_(Puenzo) / 02:_Atoms_and_Elements / 2.06:_Protons_Neutrons_and_Electrons_in_Atoms
2.6: Protons, Neutrons, and Electrons in Atoms
29 juill. 2022Because the sum of the numbers of protons and neutrons equals the mass number, 127, the number of neutrons is 74 (127 − 53 = 74). Since the iodine is added as a 1− anion, the number of electrons is 54 [53 – (1-) = 54]. Exercise 2.6.1. An ion of platinum has a mass number of 195 and contains 74 .

https://en.wikipedia.org/wiki/Electron

https://en.wikipedia.org/wiki/Electron
Electron – Wikipedia
Electrons have an electric charge of −1.602 176 634 … If the number of electrons is different from the nucleus’s electrical charge, such an atom is called an ion. The wave-like behavior of a bound electron is described by a function called an atomic orbital. Each orbital has its own set of quantum numbers such as energy, angular momentum …

https://www.thoughtco.com/protons-neutrons-and-electrons-in-an-atom-603818

https://www.thoughtco.com/protons-neutrons-and-electrons-in-an-atom-603818
Number of Protons, Neutrons, and Electrons in an Atom – ThoughtCo
Updated on June 02, 2019 The three parts of an atom are positive-charged protons, negative-charged electrons, and neutral neutrons. Follow these simple steps to find the number of protons, neutrons, and electrons for an atom of any element. Key Takeaways: Number of Protons, Neutrons, and Atoms are made of protons, neutrons, and .

https://chem.libretexts.org/Courses/UWMilwaukee/CHE_125:_GOB_Introductory_Chemistry/04:_Atoms_Elements_and_the_Periodic_Table/4.05:_Defining_Isotopes

https://chem.libretexts.org/Courses/UWMilwaukee/CHE_125:_GOB_Introductory_Chemistry/04:_Atoms_Elements_and_the_Periodic_Table/4.05:_Defining_Isotopes
4.5: Defining Isotopes – Chemistry LibreTexts
Neutral atoms have the same number of electrons and protons. Atoms of an element that contain different numbers of neutrons are called isotopes. Each isotope of a given element has the same atomic number but a different mass number (A), which is the sum of the numbers of protons and neutrons.

https://en.wikipedia.org/wiki/Atomic_orbital

https://en.wikipedia.org/wiki/Atomic_orbital
Atomic orbital – Wikipedia
The first dictates that no two electrons in an atom may have the same set of values of quantum numbers (this is the Pauli exclusion principle). These quantum numbers include the three that define orbitals, as well as s, or spin quantum number. Thus, two electrons may occupy a single orbital, so long as they have values of s.

https://en.wikipedia.org/wiki/Electron_shell

https://en.wikipedia.org/wiki/Electron_shell
Electron shell – Wikipedia
The third column is the maximum number of electrons that can be put into a subshell of that type. For example, the top row says that each s-type subshell (1s, 2s, etc.) can have at most two electrons in it. Each of the following subshells (p, d, f, g) can have 4 more electrons than the one preceding it.

https://ludwig.guru/s/have+you+thought+about

www.chem.uiuc.edu/rogers/Text4/Tx42/tx42.html
Atomic Structure – University of Illinois Urbana-Champaign
The atomic number has the symbol Z. Different elements have different atomic numbers; therefore, atoms of different elements contain different numbers of protons (and electrons). Oxygen has the atomic number 8; its atoms contain 8 protons and 8 electrons. Uranium has the atomic number 92; its atoms contain 92 protons and 92 .

https://openstax.org/books/biology-2e/pages/2-1-atoms-isotopes-ions-and-molecules-the-building-blocks

https://openstax.org/books/biology-2e/pages/2-1-atoms-isotopes-ions-and-molecules-the-building-blocks
2.1 Atoms, Isotopes, Ions, and Molecules: The Building Blocks
The four elements common to all living organisms are oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). In the nonliving world, elements are found in different proportions, and some elements common to living organisms are relatively rare on the earth as a whole, as Table 2.1 shows. lesoutrali bot