Name the element in the fifth period of the periodic table with two 5p electrons.
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Electrons: 51 Protons: 51 Neutrons: 71 Period: 5 Group: 15 Block: p Element category: Metalloid (semi-metal) Electrons per shell: K2, L8, M18, N18, O5 Electron configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 3
The periodic table is arranged so that all elements with a similar outer shell of electrons (and hence similar chemical properties) appear in vertical columns, called groups, in which the principal quantum number of the outer shell of electrons increases down the column.