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The electronic configuration of Sodium i...

The electronic configuration of Sodium is `1s^(2) 2s^(2) 2p^(6) 3s^(1)` .
What information that it gives ?

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

Verified by Experts

The correct Answer is:
A
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In an atom the number of electrons in M - shell is equal to the number of electrons in the K and L - shell . Answer the question. Explanation : 1) Number of electrons in K-shell (1 s^(2)) = 2 Number of electrons in L-shell (2s^(2) sp^(6)) = 8 Total number of electrons in k & L shells = 10 2) Given that number of electrons in M-shell is equal to number of electrons in K& L- shells 3) Hence number of electrons in M-shell (3s^(2) 3p^(6) 3d^(2)) = 10 4) But , we know that before filling of 3d orbital 4s should be filled (4s^(2)) 5) So , electronic configuration is 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2) 3d^(2) What is the atomic number of element ?

AAKASH SERIES-ATOMIC STRUCTURE-Objective exercise - 1
  1. Which of the following represent an acetal/ ketal

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  2. Electronic configuration of the element with atomic number 56 and mass...

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  3. The electronic configuration of Sodium is 1s^(2) 2s^(2) 2p^(6) 3s^(1) ...

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  4. The correct valence electronic configuration for Cu(z = 29) is

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  5. Which one of the following pairs of ions have the same electronic conf...

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  6. The (n+l) value for 4f sub-shell is

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  7. The energy of the electron in the hydrogen atom is given by the expres...

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  8. After 3d-su level is completely filled the differentiating electron en...

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  9. The electronic configuration of chromium (Z=24) is

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  10. The configuration 1s^(2)2s^(2) 2p^(6)3s^(2)3p^(3) corresponds to

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  11. To which element does the following electronic configuration correspon...

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  12. The total number of 'p' electrons present in phosphorous atom is

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  13. Element with atomic number 38, belongs to

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  14. Among N^(-3), O^(-2), F^(-), Na^(+), Mg^(+2) and Al^(+3) (a) What is...

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  15. The number of unpaired electrons in the valance shell of silicon is

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  16. a) An orbital can hold only two electrons b) An orbital must have e...

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  17. Which of the following electronic configuration corresponds to an iner...

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  18. The rule that explain the reason for chromium to have [Ar]3d^(5)4s^(1)...

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  19. Which of the following configuration is not possible ?

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  20. Which of the following ions is not isoelectronic with O^(2-)

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