Question
Which has more energy.
- Last electron of $\mathrm{Cl}^{-}$or last electron of $\mathrm{O}^{2-}$
- $n=4, I=3$ or $n=5, I=2$
✓
Answer
$[\because4\text{f}$ has lower value of $'n\ '$ although both have same value of $(n + l)]$
$n = 4, l = 3$ represents $4f$ orbital.
$n = 5, l = 2$ represents $5d$ orbital.
$\because l = 0$ for $'s\ ' l = 1$ for $'p\ ', l = 2$ for $'d\ '$
$l = 3$ for $'f\ '$
$n = 4, l = 3$ represents $4f$ orbital.
$n = 5, l = 2$ represents $5d$ orbital.
$\because l = 0$ for $'s\ ' l = 1$ for $'p\ ', l = 2$ for $'d\ '$
$l = 3$ for $'f\ '$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What do you meant by isomerism? Classify it.
A human adult breathes in approximately 0.50L of air at 1atm with each breath. If an air tank holds 10L of air at 200atm, how many breaths the tank will supply?
Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas A and an alkaline solution. The solution on exposure to air produces a thin solid layer of B on the surface. Identify the compounds A and B.
What is the effect of reducing volume on the following system?
$2\text{C}(\text{s})+\text{O}_2\rightleftharpoons2\text{CO}(\text{g})$
→$2\text{C}(\text{s})+\text{O}_2\rightleftharpoons2\text{CO}(\text{g})$
The ring systems having following characteristics are aromatic.
→- Planar ring containing conjugated $\pi$ bonds.
- Complete delocalisation of the $\pi$−electrons in ring system i.e. each atom in the ring has unhybridised p-orbital, and
- Presence of (4n + 2)$\pi$−electrons in the ring where n is an integer (n = 0, 1, 2, ..........) [Huckel rule].
- List two properties showing similarity between.
- State as to why a solution of $\mathrm{Na}_2 \mathrm{CO}_3$ is alkaline in nature?
Name the species that will be isoelectronic with the following atoms or ions:
i. $Na$
ii. $\mathrm{Cl}^{-}$
iii. $\mathrm{Ca}^{2+}$
iv. $\mathrm{Rb}^{+}$
→i. $Na$
ii. $\mathrm{Cl}^{-}$
iii. $\mathrm{Ca}^{2+}$
iv. $\mathrm{Rb}^{+}$
By mistake, an alcohol (boiling point 97°C) was mixed with a hydrocarbon (boiling point 68°C). Suggest a suitable method to separate the two compounds. Explain the reason for your choice.
Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge?
1. 2 s and 3 s
2. 4 d and 4 f
3. 3 p and 3 f.
1. 2 s and 3 s
2. 4 d and 4 f
3. 3 p and 3 f.
A hypothetical electromagnetic wave is shown in Fig. Find out the wavelength of the radiation.
