Atomic Structure Atoms consist of a dense,positively charged nucleus surrounded by negatively charged electrons ■ The nucleus consists of neutrons and protons ■ Electrons have negligible mass and circulate around the nucleus ■ The nucleus,although extremely small(~10-15 m) contains essentially all the mass of the atom. Electrical Mass charge Symbol (amu) Location Proton 1+ p 1.00728 nucleus Neutron 0 n 1.00894 nucleus Electron 1- e 0.00054 outside nucleusAtomic Structure „ Atoms consist of a dense, positively charged nucleus surrounded by negatively charged electrons „ The nucleus consists of neutrons and protons „ Electrons have negligible mass and circulate around the nucleus „ The nucleus, although extremely small (~10-15 m) contains essentially all the mass of the atom. ____________________________________________________ Electrical Mass charge Symbol (amu) Location Proton 1+ p 1.00728 nucleus Neutron 0 n 1.00894 nucleus Electron 1- e 0.00054 outside nucleus