« previous next »

Author Question: How many valence electrons does a Cl atom have? (Read 586 times)

Caiter2013

  • Hero Member
  • *****
  • Posts: 607
on: Sep 20, 2013
The electron configuration for chlorine, Cl is [Ne]3s23p5. How many valence electrons does a Cl atom have?
Write the symbol for the ion it forms to achieve a noble-gas configuration.


penza

  • Hero Member
  • *****
  • Posts: 1,022
Reply #1 on: Sep 20, 2013
If you count from left to right on the periodic table, Cl is in the 7th group, so 7 valence electrons.

It would achieve Argon electron configuration by gaining an electron.

1s2, 2s2, 2p6, 3s2, 3p6, which is the configuration of Argon.

Oh - and the ion it forms would be Cl-

hope that helps!


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

mydiamond

  • Hero Member
  • *****
  • Posts: 804
Reply #2 on: Sep 20, 2013
Chlorine comes under group 17. Therefore, it has 7 unpaired valence electrons.

http://macro.lsu.edu/russo/Courses/1201WebS99/pictures/LewisCl.gif  - This image shows you the no. of valence electrons.

As it has 7 unpaired electrons, it needs just one more to complete its octet in order to attain stable noble gas configuration (of Argon).
Here is the diagram of chloride ion: http://www.green-planet-solar-energy.com/images/chloride-ion.gif

Symbol : Cl^-


« previous next »
 

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Benzene delocalized electrons Benzene delocalized electrons
Covalent bonds form by the sharing of electrons Covalent bonds form by the sharing of electrons
Atom formation Atom formation
The atom. The atom.
The molecular structure of methanol showing the one carbon atom, four hydrogen atoms, and one ... The molecular structure of methanol showing the one carbon atom, four hydrogen atoms, and one ...
In 1994 a team of German physicists created an atom of Element 110. If the atom In 1994 a team of German physicists created an atom of Element 110. If the atom
Video: Virtual Tour of the Eye Animation

For a complete list of videos, visit our video library