(B) Given $l$ ranges from $0$ to $(n+1)$.For $n=1$,$l=0, 1, 2$ (orbitals: $1s, 1p, 1d$).For $n=2$,$l=0, 1, 2, 3$ (orbitals: $2s, 2p, 2d, 2f$).Applying

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(B) Given $l$ ranges from $0$ to $(n+1)$.For $n=1$,$l=0, 1, 2$ (orbitals: $1s, 1p, 1d$).For $n=2$,$l=0, 1, 2, 3$ (orbitals: $2s, 2p, 2d, 2f$).Applying the $(n+l)$ rule for energy order: $1s (1+0=1) Electronic configuration for atomic number $9$: $1s^2 1p^6 2s^1$.Since it has $1$ electron in the outermost $s$-orbital $(2s^1)$,it behaves like an alkali metal.Thus,$9$ is the first alkali metal.

Class 11 Chemistry Structure of Atom Quantum number, Electronic configuration and Shape of orbitals

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Consider the hypothetical situation where the azimuthal quantum number,$l$,takes values $0, 1, 2, \ldots, n+1$,where $n$ is the principal quantum number. Then,the element with atomic number

JEE MAIN 2020 All JEE MAIN

A
$13$ has a half-filled valence subshell
B
$9$ is the first alkali metal
C
$8$ is the first noble gas
D
$6$ has a $2p$ valence subshell

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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For the last electron entering the electronic configuration of potassium $(K)$,the values of $n, l,$ and $m$ are respectively .......

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In the following two plots,$\psi^2$ is plotted against the distance '$r$' from the nucleus. Select the correct statement.

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For $n = 3$,what is the total number of orbitals and electrons present?

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Which of the following is the correct electronic configuration of $Cr$?

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The orbital occupied by an electron with quantum numbers $n = 4, l = 3, m = 0$ and $s = -\frac{1}{2}$ is called

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Consider the hypothetical situation where the azimuthal quantum number,$l$,takes values $0, 1, 2, \ldots, n+1$,where $n$ is the principal quantum number. Then,the element with atomic number

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For the last electron entering the electronic configuration of potassium $(K)$,the values of $n, l,$ and $m$ are respectively .......

In the following two plots,$\psi^2$ is plotted against the distance '$r$' from the nucleus. Select the correct statement.

For $n = 3$,what is the total number of orbitals and electrons present?

Which of the following is the correct electronic configuration of $Cr$?

The orbital occupied by an electron with quantum numbers $n = 4, l = 3, m = 0$ and $s = -\frac{1}{2}$ is called

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