A positively charged particle in an atom is a proton.
A proton is a subatomic particle with a positive electric charge that is located in the nucleus of an atom. Along with electrons and neutrons, it is one of the basic components of matter.
Since the number of protons in an atom determines its atomic number, protons are essential to identifying an element. Protons and electrons have the same number in a neutral atom. Protons are essential for the stability and structure of atoms, which helps to form chemical elements and the relationships between them.