« previous next »

Author Question: In drawing the Lewis structure for the dichromate ion, how many valence electrons does chromium have? (Read 1151 times)

sammy

  • Hero Member
  • *****
  • Posts: 818
on: Sep 20, 2013
The periodic table says that Cr has only 1 valence electron but other sources say that when drawing a Lewis structure, it is considered to have 6 valence electrons. Why?


erika

  • Hero Member
  • *****
  • Posts: 522
Reply #1 on: Sep 20, 2013
6 is correct. Cr2O7(-2) gives you 7 oxygens = -14 + (-2) = 12 divided by two Cr per anion = 6 for the formal valence of Cr in dichromate.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

theo

  • Hero Member
  • *****
  • Posts: 698
Reply #2 on: Sep 20, 2013
The six valence electrons of chromium are the 4s2 and the 3d4. In this way, the chemistry of chromium is analogous to that of sulfur, 3s2 3p4.


sammy

  • Hero Member
  • *****
  • Posts: 818
Reply #3 on: Sep 27, 2013
Marking this topic solved :D

Thanks so much for the help


« previous next »
 

Did you know?

After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

Did you know?

Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

The structure of the human ear. The structure of the human ear.
HEART STRUCTURE 2 HEART STRUCTURE 2
a) Drawing of influenza virion showing the hemagglutinin (H) and the neuraminidase (N) surface ... a) Drawing of influenza virion showing the hemagglutinin (H) and the neuraminidase (N) surface ...
The structure of B-DNA from studies of molecular crystals The structure of B-DNA from studies of molecular crystals
RECONSTRUCTION DRAWING OF MAMMOTH-BONE HOUSES RECONSTRUCTION DRAWING OF MAMMOTH-BONE HOUSES
Skeletal Structure of a Lamb Skeletal Structure of a Lamb
Video: Language Areas Animation

For a complete list of videos, visit our video library