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Atomic number (Z): 17: Group: group 17 (halogens) Period: period 3: Block p-block Electron configuration [] 3s 2 3pElectrons per shell: 2, 8, 7: Physical properties; Phase at STP: gas: Melting point
Template: Periodic table (electron configuration) ... Download as PDF; ... move to sidebar hide. Electron configurations of the chemical elements (neutral ...
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This page shows the electron configurations of the neutral gaseous atoms in their ground states. For each atom the subshells are given first in concise form, then with all subshells written out, followed by the number of electrons per shell. For phosphorus (element 15) as an example, the concise form is [Ne] 3s 2 3p 3.
Grayed out electron numbers indicate subshells filled to their maximum. Bracketed noble gas symbols on the left represent inner configurations that are the same in each period. Written out, these are: He, 2, helium : 1s 2 Ne, 10, neon : 1s 2 2s 2 2p 6 Ar, 18, argon : 1s 2 2s 2 2p 6 3s 2 3p 6 Kr, 36, krypton : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 ...
Chlorine has the electron configuration [Ne]3s 2 3p 5, with the seven electrons in the third and outermost shell acting as its valence electrons. Like all halogens, it is thus one electron short of a full octet, and is hence a strong oxidising agent, reacting with many elements in order to complete its outer shell. [39]
In each term of an electron configuration, n is the positive integer that precedes each orbital letter (helium's electron configuration is 1s 2, therefore n = 1, and the orbital contains two electrons). An atom's nth electron shell can accommodate 2n 2 electrons. For example, the first shell can accommodate two electrons, the second shell eight ...
Element Group Electron configuration electron configuration (P8000) Term symbol note 1, 2, S, P, 1 H hydrogen: 1 1s 1: 1s¹ : 2 S 1/2: S: 2 He helium: 18 1s 2: 1s² : 1 S 0: S: 3 Li lithium