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The colourless ions among the lanthanides are
- a)La3+
- b)Gd3+
- c)Lu3+
- d)Ce3+
Correct answer is option 'A,B,C,D'. Can you explain this answer?
Verified Answer
The colourless ions among the lanthanides area)La3+b)Gd3+c)Lu3+d)Ce3+C...
La3+, Gd3+ and Lu3+ have empty (4f0) half-filled (4f7) and full-filled (4f14) orbitals. Ce3+ (4f1) is colourless because it does not absorb in the visible region.
Most Upvoted Answer
The colourless ions among the lanthanides area)La3+b)Gd3+c)Lu3+d)Ce3+C...
The lanthanides series is a group of 15 metallic elements that are located in the periodic table between atomic numbers 57 and 71. These elements have similar chemical and physical properties due to their similar electron configurations. One interesting property of the lanthanides is their ability to form colourless ions.
Colourless ions are those that have no visible colour in aqueous solution. The colour of an ion is determined by the energy difference between the ground state and an excited state. If this energy difference is in the visible region of the electromagnetic spectrum, the ion will absorb certain colours of light and appear coloured. If the energy difference is outside of the visible region, the ion will not absorb any colours of light and will appear colourless.
The colourless ions among the lanthanides include:
1. La3+ (Lanthanum ion): Lanthanum is the first element in the lanthanides series and has the electron configuration [Xe] 5d1 6s2. The lanthanum ion, La3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
2. Gd3+ (Gadolinium ion): Gadolinium is the seventh element in the lanthanides series and has the electron configuration [Xe] 4f7 5d1 6s2. The gadolinium ion, Gd3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
3. Lu3+ (Lutetium ion): Lutetium is the last element in the lanthanides series and has the electron configuration [Xe] 4f14 5d1 6s2. The lutetium ion, Lu3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
4. Ce3+ (Cerium ion): Cerium is the fifth element in the lanthanides series and has the electron configuration [Xe] 4f1 5d1 6s2. The cerium ion, Ce3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
In summary, the lanthanides series contains elements that can form colourless ions due to their electron configurations and the energy differences between their ground and excited states. Lanthanum, gadolinium, lutetium, and cerium are examples of lanthanides that form colourless ions.
Colourless ions are those that have no visible colour in aqueous solution. The colour of an ion is determined by the energy difference between the ground state and an excited state. If this energy difference is in the visible region of the electromagnetic spectrum, the ion will absorb certain colours of light and appear coloured. If the energy difference is outside of the visible region, the ion will not absorb any colours of light and will appear colourless.
The colourless ions among the lanthanides include:
1. La3+ (Lanthanum ion): Lanthanum is the first element in the lanthanides series and has the electron configuration [Xe] 5d1 6s2. The lanthanum ion, La3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
2. Gd3+ (Gadolinium ion): Gadolinium is the seventh element in the lanthanides series and has the electron configuration [Xe] 4f7 5d1 6s2. The gadolinium ion, Gd3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
3. Lu3+ (Lutetium ion): Lutetium is the last element in the lanthanides series and has the electron configuration [Xe] 4f14 5d1 6s2. The lutetium ion, Lu3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
4. Ce3+ (Cerium ion): Cerium is the fifth element in the lanthanides series and has the electron configuration [Xe] 4f1 5d1 6s2. The cerium ion, Ce3+, has lost three electrons and has the noble gas electron configuration of [Xe]. It is colourless in aqueous solution.
In summary, the lanthanides series contains elements that can form colourless ions due to their electron configurations and the energy differences between their ground and excited states. Lanthanum, gadolinium, lutetium, and cerium are examples of lanthanides that form colourless ions.
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The colourless ions among the lanthanides area)La3+b)Gd3+c)Lu3+d)Ce3+C...
Only the elements having unpaired electrons are colourless(La3+ and Lu 3+) .The rest has half filled orbitals and they have unpaired electrons ,therefore they show colour
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