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Describe the trends in the formulas of period 3 (third row) chlorides and relate these...

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user1191221 | (Level 1) Honors

Posted May 28, 2013 at 11:12 AM via web

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Describe the trends in the formulas of period 3 (third row) chlorides and relate these to the electron configurations of the elements.

 

 

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pramodpandey | College Teacher | (Level 3) Valedictorian

Posted May 28, 2013 at 11:48 AM (Answer #1)

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The modern Periodic Table is arranged in order of increasing atomic number. As one moves from one element to another on the right, one more proton is found in the nucleus, and one more electron is found in the same electron 'shell' (energy level).

Name of     Na   |  Mg |    Al |    Si |    P |     S |     Cl |      Ar  |       

element------------------------------------------------------------

Atomic        11   |   12 |      13 |     14 |   15 |    16 |      17 |    18 |

number ------------------------------------------------------------

Electronic    2,8,1 | 2,8,2 | 2,8,3 |  2,8,4|2,8,5| ,2,8,6| 2,8,7 |2,8,8

configuration-------------------------------------------------------

Chloride       NaCl | MgCl_2 | AlCl_3| SiCl_4| PCl_3|SCl_2 | Cl_2

formula

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Aluminium forms a covalent anydrous aluminium chloride, Al2Cl6 .

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