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Definition-An atom is a source of nuclear energy.

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

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Definition-A atomic number is the number of protons found in the nucleus of an 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

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Definition-A Electron is a stable subatomic particle with a charge of negative electric.

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/

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Definition-A Electron Dot Diagram representation of the valence electrons in a atom.

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

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Definition-An "element" is a pure substance that cannot be broken down into simpler substances by chemical means, meaning it is composed of only one type of atom and can't be further separated into other elements through normal chemical reactions; each element is identified by its unique atomic number, which represents the number of protons in its nucleus

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

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Definition-A specific, fixed distance from an atom's nucleus where electrons can be found, representing a distinct amount of energy that an electron can possess within an atom.

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

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Definition-An atom or molecule that has a net electrical charge, either positive (cation) or negative (anion), resulting from the loss or gain of electrons.

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

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Definition-A variant of a chemical element where atoms have the same number of protons (atomic number) but a different number of neutrons, resulting in different atomic masses while still maintaining the same chemical properties

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.

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Definition-The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.

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/

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Definition-neutron, neutral subatomic particle that, in conjunction with protons, makes up the nucleus of every atom except ordinary hydrogen (whose nucleus has one proton and no neutrons). Along with protons and electrons, it is one of the three basic particles making up atoms, the basic building blocks of all matter and chemistry.

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.

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Definition-A nucleus, as related to genomics, is the membrane-enclosed organelle within a cell that contains the chromosomes. An array of holes, or pores, in the nuclear membrane allows for the selective passage of certain molecules (such as proteins and nucleic acids) into and out of the nucleus.

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.

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Definition-The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows and columns. It is an icon of chemistry and is widely used in physics and other sciences

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

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Definition-A proton is a positively charged subatomic particle found in the nucleus of an atom, considered one of the fundamental building blocks of matter, and its number within an atom determines the element it belongs to (atomic number); the word "proton" comes from Greek meaning "first" and was coined by Ernest Rutherford.

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.

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Definition-An atom is unstable and spontaneously emits radiation (energy in the form of particles) from its nucleus as it decays to become a more stable atom, often transforming into a different element; essentially, a radioactive substance is one that releases radiation due to an unstable atomic nucleus.

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

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Definition-In chemistry and physics, valence electrons are electrons in the outermost shell of an atom, and that can participate in the formation of a chemical bond if the outermost shell is not closed. In a single covalent bond, a shared pair forms with both atoms in the bond each contributing one valence electron

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