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The color of chromate (yellow) and dichromate (orange) comes from the chromium. In particular from the arrangement of electrons in the 3d-sublevel.
You were probably taught that the d-orbitals are all at the same energy, and that's true if there were not other atoms attached to chromium. Since chromium is in a polyatomic ion which has water molecules attached to it, there is some splitting of the energy levels of the chromium's d-orbitals and it is the difference in these two energy levels that absorbs certain wavelengths of light and not others.
The light that is not absorbed is orange, which is what you see when you look at solutions of the dichromate ion.
What else can I help you with?
Where are the protons in a potassium atom?
Protons in potassium are located in the necules
If a bromine atom were to attract an extra electrons from potassium the potassium atom would become charged?
The potassium atom would become positively charged - or a cation.
How many atoms are found in potassium hydroxide?
There are 3 atoms in each molecule of Potassium Hydroxide.The molecular formula is KOH. Hence, there is one atom of Potassium, one of Oxygen and one of Hydrogen.
How many electrons does an atom potassium havew?
Finding the number of electrons in an atom is easy. You just have to know the atomic number of the element. The atomic number for Potassium is 19. That means Potassium has 19 electrons.
What is the number of nuetrons in a potassium atom?
The most common isotope is 20
Why potassium dichromate is orange red in color?
The orange color of potassium dichromate is caused by the movement of an electron to a vacant d-orbital in the manganese atom. The transition occurs when the chemical is in the presence of light. This is confirmed by the empty 3d-orbital in chromium.
What is Valency of potassium dicromate?
The valency of potassium dichromate is +6. This is because potassium has a valency of +1, and each chromium atom in the dichromate ion has a valency of +6.
What is the atomicity of potassium dichromate?
Potassium dichromate is a compound made up of potassium, chromium, and oxygen atoms. Its atomicity is determined by the number of atoms per molecule, which in this case is 3: one potassium atom, two chromium atoms, and seven oxygen atoms. So, the atomicity of potassium dichromate is 3.
What is the oxidation number of Cr is acidified potassium dichromate?
The oxidation number of Cr in acidified potassium dichromate (K2Cr2O7) is +6. This is because each oxygen atom has an oxidation number of -2, and the overall charge of the dichromate ion is -2.
What is the oxidation number of one chromium atom in potassium dichromate?
The oxidation number of one chromium atom in potassium dichromate (K2Cr2O7) is +6. This is because each oxygen atom has an oxidation number of -2 and each potassium atom has an oxidation number of +1, so the overall charge of the compound is zero, making the oxidation number of chromium +6 to balance it out.
What makes up potassium phosphide?
K3P, three atoms of Potassium and one atom of phosphorous.
In potassium dichromate and potassium chromate the oxidation state of chromium is 6 but both have different colors?
Cr(VI) should have no unpaired electrons and have no color, but when bound to oxygen, charge transfer occurs from the O 2-. CrO4 (chromate) has four oxygens which all charge transfer to the Chromium giving orange color. In Cr2O7 (dichromate) one oxygen bridges between the two Chromium atoms so each only gets charge transfer from three oxygens. Cr(VI) should have no unpaired electrons and have no color, but when bound to oxygen, charge transfer occurs from the O 2-. CrO4 (chromate) has four oxygens which all charge transfer to the Chromium giving orange color. In Cr2O7 (dichromate) one oxygen bridges between the two Chromium atoms so each only gets charge transfer from three oxygens.
Where are the protons in a potassium atom?
Protons in potassium are located in the necules
What ionic charge does a regular atom of potassium have?
An ordinary atom of potassium has no charge.An ionized atom of potassium typically has a +1 charge.Different things.
A potassium atom has how many electrons?
The neutral atom of potassium has 19 electrons.
What are the atoms in one molecule of potassium hydroxide?
The chemical formula of potassium hydroxide is KOH: 1 atom of potassium, 1 atom of oxygen, 1 atom of hydrogen.
How may potassium atoms do you think combine with a chlorine atom?
One potassium atom can combine with one chlorine atom to form potassium chloride.
