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1s 2 2s 2 p 6 3s 2 p 6 d 10 4s 1. Electrons per Energy Level: 2,8,18,1. Shell Model. Powers of 10 project is to draw the atomic structures of copper (atomic number 29) and iron (atomic number 26) and then compare with alloys like brass, bronze, steel, and stainless steel.
Copper has an atomic number of 29 and a mass number of 64. What would result if an uncharged copper atom lost two electrons? The atomic number would remain 29, the mass number would remain 64, and the atom would be a cation with a +2 charge. The compound CaSO4 ionizes into a calcium ion and a sulfate ion (SO4). Calcium has 2 electrons in its outer shell.