What is an atom? In this video, you will the definition of "atom". Also, This video shows that structure of an atom is made of subatomic particle protons, neutrons and electrons .The number of protons in the nucleus determines which element. The number of proton and neutrons determine the overall mass of an atom. All mass of an atom is located in the tiny and dense nucleus. The positive charge of the protons and the negative charge of the electrons make up the net charge of an atom. Elements can have different atoms by having number atoms of neutrons and electrons . In a neutral atom, it carry no overall charge, the number of protons and electrons must be equal, thus cancelling out their charges. Electrons are moving in circular orbits around the nucleus in shells, with definite rules governing how many electrons each shell can hold. Our Website: http://winscience.net/ Our Youtube Channel: https://www.youtube.com/channel/UCPwyvFiDqns0ekGiPOJxgRQ Our Twitter: @winscienceTs Facebook Group: Blended Chemistry Class https://www.facebook.com/groups/138296409958593/