Proton

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 A proton is a subatomic particle with a charge of +1.60x10-19c and a mass of 1.67x10-27kg. It is a baryon and so consists of 3 quarks, two up quarks and one down quark, it can therefore feel the strong nuclear force. It's antiparticle is the antiproton. 

The isotope of hydrogen- H11, also known as protium, is made up of one proton (no electrons) and so is the lightest element.