Answer:
Helium (He)
Concepts:
The electron is an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 * 10^-19 coulombs, a mass of 9.108 * 10^-31 kilograms, and spin of 1/2, and existing independently or as the components outside the nucleus of the atom.
The proton is a positively charged elementary particle that 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 1/2, and a mass of 1.673 * 10^-27 kg. Symbol: P.
Helium is an inert, gaseous element present in the sun's atmosphere and in natural gas, and also occurring as a radioactive composition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; atomic weight: 4.0026; atomic number: 2; density: 0.1785 g/l at 0°C and 760 mm pressure.
The element that has two electrons and one proton is helium (He). Helium is the second lightest element in the periodic table and is a noble gas. It is chemically inert and has a full outer electron shell, which makes it stable and unreactive.