Which one among the following principal energy level has exactly four subshells?

1

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3

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4

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5

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Solution

The correct option is D $4$
The fourth principal energy level $(n = 4)$ has exactly four subshells $4 s, 4 p, 4 d$ and $4 f$ .

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The subshell 4s has the smaller energy than the subshell 3d.But the subshell configuration of Cr is 1s² 2s²2p⁶3s²3p⁶ 3d⁵4s¹.why did 3d came 1^stand 4s after it ???

Q. Assertion: 3s, 3p and 3d subshells of hydrogen have the same energy.
Reason: Energy of subshells in the hydrogen atom, depends on the principal quantum number (n) and azimuthal quantum number (l).

3 (x + 1) = - \frac{1}{2} - 5 x

Which of the following best describes the solution set to the equation shown above ?

Q. Select the correct statement(s) among the following:
(i) Total number of orbitals in a shell with principal quantum number '

n

' is

n^{2}

.
(ii) Total number of subshell in the

n

th energy level is

n

.
(iii) The maximum number of electrons in a subshell is given by the expression

(4 l + 2)

.
(iv)

m = l + 2

, where

l

and

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are azimuthal and magnetic quantum numbers.

Q. If two subshells have equal value of (n+1) and one of them has n=4, l=3, while second subshell has dumbbellshape. Then which of the bfollowing statement is/are correct?

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Which one among the following principal energy level has exactly four subshells?

The correct option is D 4The fourth principal energy level (n=4) has exactly four subshells 4s,4p,4d and 4f.

The correct option is D $4$
The fourth principal energy level $(n = 4)$ has exactly four subshells $4 s, 4 p, 4 d$ and $4 f$ .