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The electronic configuration 1s^(2)2s^(2...

The electronic configuration `1s^(2)2s^(2)2p^(6)3s^(1)3p^(3)3d^(2)` represents

A

Ground state

B

1st excited state

C

2nd excited state

D

3rd excited state

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The correct Answer is:
C
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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 ?

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) Which is the outermost cell ?

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) How many electrons are there in its outermost shell ?

AAKASH SERIES-ATOMIC STRUCTURE-Objective Exericse - 2A
  1. Given this set of quantum numbers for a multi electron atom 2, 0, 0, a...

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  2. Which one of the following pairs of atoms/ions have identical ground s...

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  3. How many 'd' electrons are present in Cr^(2+) ion?

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  4. The atomic nụmber of the element with the maximum number of unpaired 2...

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  5. The total number of electrons present in all the 's' orbitals, all the...

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  6. Which atom has as many 's' electrons as P-electrons

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  7. An element has 2 electrons in its K-shell. 8 electrons in L-shell, 13 ...

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  8. The electronic configuration 1s^(2)2s^(2)2p^(6)3s^(1)3p^(3)3d^(2) repr...

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  9. The atomic number of an element M is 20. How many electrons are presen...

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  10. Consider the ground state of Cr atom (Z = 24). The numbers of electron...

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  11. Which is the first element to have 4d-electron in its electronic confi...

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  12. In the ground state, an element has 13 electrons in its "M - shell". T...

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  13. (A) : The electronic configuration of Cr is [Ar]3d^(5)4s^(1) but not [...

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  14. The electrons identified by quantum number n and l are (I) n = 1, l ...

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  15. (A) : Fe^(3+) (g) is more stable than Fe^(2+) (g). (R) : Fe^(3+) (g)...

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  16. In which of the following Aufbau principle is violated?

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  17. Which of the following electronic configuration is not possible?

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  18. The configuration 1s^(2)2s^(2)2p^(5)3s^(1) shows

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  19. Which of the following has maximum unpaired d-electrons?

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  20. Consider the ground state of Cr atom (Z = 24). The numbers of electron...

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