Example-An example of an atom is a hydrogen atom. Other examples include oxygen, carbon, nitrogen, and iron, which are all single atoms that make up different elements on the periodic table. 

Website-https://www.cancer.gov/publications/dictionaries/cancer-terms/def/atom

Example- The atomic number of oxygen would be 8 because that's how much protons are in the nucleus.

Website-https://www.britannica.com/science/atomic-number

Example-An example of an electron would be the single negatively charged particle orbiting the nucleus of a hydrogen atom

Website-https://opentextbc.ca/introductorychemistry/chapter/lewis-electron-dot-diagrams/

Ex-An example of an electron dot diagram would be the representation of Oxygen (O) with six dots around the symbol

Website-https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/08%3A_Ionic_and_Metallic_Bonding/8.01%3A_Electron_Dot_Diagrams

Example-An example of an element is oxygen; other examples include hydrogen, helium, carbon, nitrogen, iron, and gold, as they are all substances that cannot be broken down into simpler substances and are made up of only one type of atom

Website-https://www.cancer.gov/publications/dictionaries/cancer-terms/def/element

Example-The first energy level of a helium atom, which can hold only two electrons, or the second energy level of a sodium atom, which holds the majority of its electrons

Website-https://www.merriam-webster.com/dictionary/energy%20level

Example-A common example of an ion in chemistry is a sodium ion (Na+); when a sodium atom loses an electron, it becomes positively charged and is considered a cation.

Website-https://study.com/learn/lesson/what-is-an-ion-examples.html

Example-A common example of an isotope in chemistry is carbon-12, carbon-13, and carbon-14; all three are different forms of carbon atoms with the same number of protons but different numbers of neutrons, making them isotopes of each other

Website-https://www.energy.gov/science/doe-explainsisotopes#:~:text=For%20example%2C%20carbon%20has%20six,its%20own%20number%20of%20isotopes.

Example-A common example of a mass number is 12, which is the mass number of a carbon atom, as it has 6 protons and 6 neutrons, adding up to 12; represented as "Carbon-12" or "C-12". 

Website-https://www.toppr.com/guides/chemistry/structure-of-atom/mass-number/

Example-A neutron can be found in the nucleus of almost any atom, except for most hydrogen atoms; for example, a carbon-12 atom contains 6 protons and 6 neutrons, making it a common example of a neutron in action within an atom

Website-https://www.space.com/neutrons-facts-discovery-charge-mass#:~:text=For%20example%2C%20ordinary%20hydrogen%20contains,together%20by%20the%20Strong%20Force.

Example-A good example of a nucleus is the central core of a human cell, which contains all the genetic material (DNA) organized into chromosomes, essentially acting as the "command center" of the cell; other examples include the nucleus of any plant or animal cell, as all eukaryotic cells possess a nucleus. 

Website-https://www.genome.gov/genetics-glossary/Nucleus#:~:text=Definition,and%20out%20of%20the%20nucleus.

Example-The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element

Website-https://www.britannica.com/science/periodic-table

Example-A simple example of a proton in chemistry is the nucleus of a hydrogen atom, which consists of only one proton; meaning that a single hydrogen atom is essentially just a proton. 

Website-https://www.thoughtco.com/definition-of-proton-604622#:~:text=Examples%20of%20Protons,3%20protons%20and%20so%20on.

Example-A common example of a radioactive element in chemistry is uranium; other examples include radium, thorium, and polonium, which are naturally occurring, while elements like plutonium and einsteinium are man-made radioactive elements. 

Website-https://wwwn.cdc.gov/tsp/substances/ToxChemicalListing.aspx?toxid=27

Example-An example of valence electrons is oxygen, which has six valence electrons; two in the 2s subshell and four in the 2p subshell, making its electron configuration for valence electrons "2s²2p⁴". 

Website-https://socratic.org/questions/what-are-some-examples-of-valence-electrons