MCQ
The quantum number/s needed to describe an electron fully in an atom is/are:
- A$1$
- B$2$
- C$3$
- ✓$4$
✓
Answer
Correct option: D.
$4$
d
The number of quantum numbers needed to completely define an electron in the orbit of an atom is $4 .$
The number of quantum numbers needed to completely define an electron in the orbit of an atom is $4 .$
Thus all the four quantum numbers $n , l , m$ and $n$ are required. This is in accordance with Pauli's exclusion principle according to which, no two electrons in an atom can have the same set of four quantum numbers.
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
$0.3\,g$ of ethane undergoes combustion at $27^{\circ}\,C$ in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by $0.5^{\circ}\,C$. The heat evolved during combustion of ethane at constant pressure is $.......kJ\,mol { }^{-1}$.
→(Nearest integer)
[Given : The heat capacity of the calorimeter system is $20\, kJ\, K ^{-1}, R =8.3\, JK ^{-1}\, mol ^{-1}$.
Assume ideal gas behaviour.
Atomic mass of $C$ and $H$ are $12$ and $1\, g\, mol ^{-1}$ respectively]
For the reaction $FeCO_{3(s)} \to FeO_{(s)} + CO_{2(g)}$ $\Delta H = 82.8\,kJ$ at $25\,^oC$. What is $\Delta U$ at $25\,^oC$ ? .....$kJ$
→Which species do not have $s{p^3}$ hybridization
→$(R)-3$ -bromocyclopentene (shown below) reacts with $Br_2/CCl_4$ to form two products, $Y$ and $Z, Y$ is not optically active (does not rotate plane- polarized light). What is the structure of $Y$ ?
→Which of the following is Lewis acid
The radius of second Bohr orbit is $x.$ The de-Broglie wavelength of electron in $4^{th}$ orbit is nearly
→Some pairs of acids are given below. Select the pair in which second acid is stronger than first
Dipole moment is usually designated by a Greek letter $'\mu\ ': \mu=\text{Q}\times\text{r}$ Here, $Q$ and $r$ represents.
→The $IUPAC$ name of (figure) is
→Which of the following is correct?