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Positively charged subatomic particles which are found in the nucleus of atoms. A hydrogen atom contains 1 proton and 1 electron therefore a 1+hydrogen ion/ H+ (which has lost its electron) can be said to be a proton. 

A proton is a subatomic particle with a charge of +1.60 x 10-19 c and a mass of 1.67 x 10-27 kg. 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.

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