what mass does a neutron have ?

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https://www.britannica.com/science/neutron

https://www.britannica.com/science/neutron
Neutron | Definition, Charge, Mass, Properties, & Facts
3 nov. 2023The neutron has no electric charge and a rest mass equal to 1.67492749804 × 10 −27 kg—marginally greater than that of the proton but 1,838.68 times greater than that of the electron.
Radioactive Isotopes
For example, hydrogen, the lightest element, has three isotopes, which have mass numbers 1, 2, and 3. Only hydrogen-3 , however, is a radioactive isotope; the other two are stable. More than 1,800 radioactive isotopes of the various elements are known. Some of these are found in nature; the rest are produced artificially as the direct products …
Half-Life
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive material to decrease by one-half. …

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

https://en.wikipedia.org/wiki/Neutron
Neutron – Wikipedia
Neutrons do not affect the electron configuration, but the mass of the nucleus is approximately equal to the sum of proton and neutron masses, minus a small amount due to nuclear binding energy. [8] : 822 Atoms of a chemical element that differ only in neutron number are called isotopes.

https://chem.libretexts.org / Courses / can / intro / 04:_Atoms_and_Elements / 4.4:_The_Properties_of_Protons_Neutrons_and_Electrons

https://chem.libretexts.org / Courses / can / intro / 04:_Atoms_and_Elements / 4.4:_The_Properties_of_Protons_Neutrons_and_Electrons
4.4: The Properties of Protons, Neutrons, and Electrons
If an electron was the mass of a penny, a proton or a neutron would have the mass of a large bowling ball! Protons. A proton is one of three main particles that make up the atom. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (left( +1 …

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 juil. 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 2.6. 1. An ion of platinum has a mass number of 195 and contains 74 electrons.

https://chem.libretexts.org/Courses/Anoka-Ramsey_Community_College/Introduction_to_Chemistry/04:_Atoms_and_Elements/4.04:_Protons_Neutrons_and_Electrons

https://chem.libretexts.org/Courses/Anoka-Ramsey_Community_College/Introduction_to_Chemistry/04:_Atoms_and_Elements/4.04:_Protons_Neutrons_and_Electrons
4.4: Protons, Neutrons, and Electrons – Chemistry LibreTexts
4.4: Protons, Neutrons, and Electrons is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts. Atoms are composed of protons, neutrons, and electrons. Electrons are extremely small. The mass of an electron is only about 1/2000 the mass of a proton or , so electrons contribute virtually ….

https://www.khanacademy.org/science/biology/chemistry–of-life/elements-and-atoms/a/atomic-number-atomic-mass-and-isotopes-article

https://www.khanacademy.org/science/biology/chemistry–of-life/elements-and-atoms/a/atomic-number-atomic-mass-and-isotopes-article
Atomic number, atomic mass, and isotopes – Khan Academy
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s number is its atomic .

https://chem.libretexts.org/Courses/Heartland_Community_College/CHEM_120:_Fundamentals_of_Chemistry/02:_Atoms_and_Elements/2.04:_Neutrons:__Elemental_Isotopes_and_Mass_Number_Calculations

https://chem.libretexts.org/Courses/Heartland_Community_College/CHEM_120:_Fundamentals_of_Chemistry/02:_Atoms_and_Elements/2.04:_Neutrons:__Elemental_Isotopes_and_Mass_Number_Calculations
2.4: Neutrons: Isotopes and Mass Number Calculations
CHEM 120: Fundamentals of Chemistry 2: Atoms and Elements

https://simple.wikipedia.org/wiki/Neutron

https://simple.wikipedia.org/wiki/Neutron
Neutron – Simple English Wikipedia, the free encyclopedia
Neutrons have a mass of 1.675 × 10 -24 g, [8] which is a little heavier than the proton. [8] Neutrons are 1839 times heavier than electrons. [8] Like all hadrons, neutrons are made of quarks. A neutron is made of two down quarks and one up quark. [2] [3] One up quark has a charge of +2/3, and the two down quarks each have a charge of -1/3.

https://www.bbc.co.uk/bitesize/guides/z6k2gwx/revision/2

https://www.bbc.co.uk/bitesize/guides/z6k2gwx/revision/2
Atomic structure – (CCEA) Protons, neutrons and electrons – BBC
Number of neutrons = mass number – atomic number. Key fact. Remember that Protons are Positive, and Neutrons are Neutral. Question. The atomic number of a sodium atom is 11 and its mass number …

https://chem.libretexts.org/Courses/Harper_College/CHM_110:_Fundamentals_of_Chemistry/01:_The_Process_of_Science/1.15:_The_Properties_of_Protons_Neutrons_and_Electrons

https://chem.libretexts.org/Courses/Harper_College/CHM_110:_Fundamentals_of_Chemistry/01:_The_Process_of_Science/1.15:_The_Properties_of_Protons_Neutrons_and_Electrons
1.15: The Properties of Protons, Neutrons, and Electrons
All leptons have an electric charge of (-1) or (0). Electrons are extremely small. The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass of an atom. Electrons have an electric charge of (-1), which is equal but opposite to the charge of a proton, which is … lesoutrali bot