(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

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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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Class 11

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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Which among the following elements possesses one electron in the $4s$ orbital in its observed electronic configuration?

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For a given atomic orbital,$n = 3$. What are the possible values of $l$ and $m_l$?

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If the outermost electrons of an element are represented as $(a)$ $3s^1$,$(b)$ $2p^3$,and $(c)$ $3p^5$,what will be the atomic numbers of these elements?

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Which of the following orbitals has a dumbbell shape?

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If the given four electronic configurations:
$(i)$ $n=4, l=1$
$(ii)$ $n=4, l=0$
$(iii)$ $n=3, l=2$
$(iv)$ $n=3, l=1$
are arranged in order of increasing energy, then the order will be:

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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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Which among the following elements possesses one electron in the $4s$ orbital in its observed electronic configuration?

For a given atomic orbital,$n = 3$. What are the possible values of $l$ and $m_l$?

If the outermost electrons of an element are represented as $(a)$ $3s^1$,$(b)$ $2p^3$,and $(c)$ $3p^5$,what will be the atomic numbers of these elements?

Which of the following orbitals has a dumbbell shape?

If the given four electronic configurations:$(i)$ $n=4, l=1$$(ii)$ $n=4, l=0$$(iii)$ $n=3, l=2$$(iv)$ $n=3, l=1$are arranged in order of increasing energy, then the order will be:

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If the given four electronic configurations:
$(i)$ $n=4, l=1$
$(ii)$ $n=4, l=0$
$(iii)$ $n=3, l=2$
$(iv)$ $n=3, l=1$
are arranged in order of increasing energy, then the order will be: