To calculate the number of neutrons in an atom, subtract the atomic number from the mass number., Neutrons are located in the nucleus of an atom and have no charge., Protons are located in the nucleus of an atom and have a positive charge., Add the number of neutrons and protons to calculate the mass number., Electrons orbit the nucleus in shells and have a negative charge., The atomic number is equal to the number of protons., The positively charged protons are equal to the negatively charged electrons., The electron cloud is made up of shells that hold a set number of electrons., The first shell holds a maximum of two electrons and the second shell holds a maximum of eight. ,

Subatomic Structure

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