(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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Class 11

Chemistry Questions

Chapter

Structure of Atom

Subtopic

Quantum number, Electronic configuration and Shape of orbitals

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JEE MAIN 2020 Paper All JEE MAIN years →

Match the columns and choose the correct option:

Column-$I$ Column-$II$

$(a)$ $4s$ $(p)$ Circular orbit around nucleus

$(b)$ $4p$ $(q)$ Non-directional orbital

$(c)$ $1s$ $(r)$ Angular momentum $= 2h/\pi$

$(d)$ $3d$ $(s)$ Radial node is zero

Column-$I$	Column-$II$
$(a)$ $4s$	$(p)$ Circular orbit around nucleus
$(b)$ $4p$	$(q)$ Non-directional orbital
$(c)$ $1s$	$(r)$ Angular momentum $= 2h/\pi$
$(d)$ $3d$	$(s)$ Radial node is zero

Medium

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Find the exact orbital from the following for which $n=4$ and $l=1$.

EasyAP EAMCET 2020

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Which one of the following is the correct set of four quantum numbers $(n, l, m, s)$?

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The number of waves made by an electron moving in an orbit having a maximum magnetic quantum number $(m_l) = 3$ is:

Medium

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In a potassium atom,the electronic energy levels are in the following order:

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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

Similar Questions

Match the columns and choose the correct option: Column-$I$ Column-$II$ $(a)$ $4s$ $(p)$ Circular orbit around nucleus $(b)$ $4p$ $(q)$ Non-directional orbital $(c)$ $1s$ $(r)$ Angular momentum $= 2h/\pi$ $(d)$ $3d$ $(s)$ Radial node is zero

Find the exact orbital from the following for which $n=4$ and $l=1$.

Which one of the following is the correct set of four quantum numbers $(n, l, m, s)$?

The number of waves made by an electron moving in an orbit having a maximum magnetic quantum number $(m_l) = 3$ is:

In a potassium atom,the electronic energy levels are in the following order:

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Match the columns and choose the correct option:

Column-$I$ Column-$II$

$(a)$ $4s$ $(p)$ Circular orbit around nucleus

$(b)$ $4p$ $(q)$ Non-directional orbital

$(c)$ $1s$ $(r)$ Angular momentum $= 2h/\pi$

$(d)$ $3d$ $(s)$ Radial node is zero