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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.
For example the distance between two adjacent copper atoms in solid copper is 256 pm.Hence, the metallic radius of copper atom is 128 pm. Covalent and metallic radius is measured by using X-Ray spectroscopy or other spectroscopy methods. Generally atomic radius decreases across the period and increases down the group.