The nucleus of an atom is made of Protons and Neutrons. The protons have a positive charge and Neutrons have a neutral charge. Spinning around the nucleus are negatively charged Electrons. An atom is identified by a number corresponding to the number of protons in the nucleus and a name. As an example, an atom with one proton and one electron is identified by the number one and the name Hydrogen and written as 1H. An atom with two protons and two electrons is identified by the number two and the name Helium and is written as 2He. The Carbon atom is composed of six protons, six electrons and six neutrons and is written as 12C.
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