https://courses.lumenlearning.com/wsu-sandbox2/chapter/assignment-atoms-molecules-and-ions/

Assignment—Atoms, Molecules, and Ions ... {}_{14}^{8}\text{N} ​14​8​​N; The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes.

https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties

Chemistry is the study of matter, and all matter is made up of atoms. We will learn about elements, atomic number and mass, isotopes, moles (chemistry moles, ...

https://chem.libretexts.org/Courses/University_of_Kentucky/UK%3A_CHE_103_-_Chemistry_for_Allied_Health_(Soult)/Chapters/Chapter_2%3A_Elements_and_Ions/2.1%3A_Isotopes_and_Atomic_Mass

May 2, 2019 ... Isotopes are atoms of the same element with a different mass due to a ... By definition, one atom of carbon-12 is assigned a mass of exactly 12 ...

https://chem.libretexts.org/Courses/Howard_University/General_Chemistry%3A_An_Atoms_First_Approach/Unit_1%3A__Atomic_Structure/Chapter_1%3A_Introduction/Chapter_1.6%3A_Isotopes_and_Atomic_Masses

Apr 23, 2019 ... ... in which each element is assigned a unique one-, two-, or three-letter symbol. .... The isotopes of an element differ only in their atomic mass, which is given .... The extent to which the ions are deflected by the magnetic field ...

https://www2.estrellamountain.edu/faculty/farabee/biobk/BioBookCHEM1.html

Atoms | Electrons and energy | Chemical Bonding | Chemical reactions and ... Isotopes, shown in Figure 1 and Figure 2, can be used to determine the diet of .... Ionic bonds are formed when atoms become ions by gaining or losing electrons.

https://opentextbc.ca/chemistry/chapter/2-3-atomic-structure-and-symbolism/

Atoms, Molecules, and Ions ... it has been defined with regard to the most abundant isotope of carbon, atoms of which are assigned masses of exactly 12 amu.

https://phet.colorado.edu/en/simulation/build-an-atom

Build an atom out of protons, neutrons, and electrons, and see how the element, charge, and mass change. Then play a game to test your ideas!

https://www.ck12.org/book/CK-12-Chemistry-Intermediate/section/4.3/

Aug 2, 2012 ... Understand how isotopes differ from one another and be able to .... By definition, one atom of carbon-12 is assigned a mass of exactly 12 ...

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

Isotope: One of two or more species of atoms of an element with the same atomic ... The periodic table of the elements assigns one place to every atomic number, and ..... The ions in the heavier ray had masses about two units, or 10 percent, ...

https://www.energy.gov/sites/prod/files/2013/10/f3/Lesson%203%20-%20Atoms%20and%20Isotopes.pptx

What you need to know about Atoms and Isotopes: .... Advanced Student Assignment: Making Matter: Build an Atom ... changes in the structure and energy content of atoms, molecules, or ions but not their nuclei; electron – the smallest existing ...