« previous next »

Author Question: In drawing the Lewis structure for the dichromate ion, how many valence electrons does chromium have? (Read 1134 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?

There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.

Did you know?

The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

Did you know?

On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

The domain structure of a STAT protein The domain structure of a STAT protein
Two equivalent ways of drawing a phylogeny Two equivalent ways of drawing a phylogeny
Eukaryotic cell structure Eukaryotic cell structure
Steps in determining the structure of sperm whale myoglobin by x-ray crystallography Steps in determining the structure of sperm whale myoglobin by x-ray crystallography
Heme consists of a complex organic ring structure, protoporphyrin Heme consists of a complex organic ring structure, protoporphyrin
Structure of HIV Structure of HIV
Video: Monohybrid crosses

For a complete list of videos, visit our video library