Proton
Stable subatomic particle with a positive charge equal in magnitude to a unit of electron charge and a rest mass of 1.67262 × 10−27kg, which is 1,836 times the mass of an electron. Protons, together with electrically neutral particles called neutrons, make up all atomic nuclei except the hydrogen nucleus (which consists of a single proton). Every nucleus of a given chemical element has the same number of protons. This number defines an element's atomic number and determines the element's position in the periodic table. The atom is electrically neutral when the number of protons in a nucleus equals the number of electrons orbiting the nucleus. The discovery of the proton dates to the earliest investigations of atomic structure. While studying streams of ionized gaseous atoms and molecules from which electrons had been stripped, Wilhelm Wien (1898) and J.J. Thomson (1910) identified a positive particle equal in mass to the hydrogen atom. Ernest Rutherford showed (1919) that nitrogen under alpha-particle bombardment ejects what appear to be hydrogen nuclei. By 1920 he had accepted the hydrogen nucleus as an elementary particle, naming it proton [Online Encyclopedia Britannica].
A positively charged elementary particle is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of ½, and a mass of 1.673 × 10-27 kg. Symbol: P [Dictionary.com].
An elementary particle identical to the nucleus of the hydrogen atom, that along with the neutron, is a constituent of all other atomic nuclei that carries a positive charge numerically equal to the charge of an electron [Merriam-Webster Online Dictionary].
Proton. Online Encyclopedia Britannica. Retrieved from: https://www.britannica.com/science/proton-subatomic-particle
Proton. Dictionary.com. Retrieved from: https://www.dictionary.com/browse/proton
PROTON. Merriam-Webster Online Dictionary. Retrieved from: https://www.merriam-webster.com/dictionary/proton