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The number of 'd' electrons in Fe^(2+) i...

The number of 'd' electrons in `Fe^(2+)` is not equal to that of

A

s-electrons in Mg

B

p-electrons in Ne

C

p-electrons in CI

D

d-electrons in Fe

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The correct Answer is:
C
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The number of electrons in M shell is equal to the number of electrons in L shell for an element. Write the name, electronic configuration of that element and also write the values of four quantum numbers for the last electron.

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-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-2 (GENERAL PROPERTIES AND ELECTRONIC CONFIGURATION)
  1. Which of the following statements concerning transition elements is no...

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  2. The highly stable pair of ions are

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  3. Transition metal " X " has a configuration [Ar] 3d^(4) in its +3 oxida...

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  4. The number of 'd' electrons in Fe^(2+) is not equal to that of

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  5. The pair of ions which do not have same number of unpaired electrons i...

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  6. Among the transition elements the element with lowest melting point be...

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  7. The reason for the stability of Gd^(3+) ion is

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  8. Electronic configuration of a transition element is [Ar] 4s^23d^6. A s...

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  9. Transition elements have higher enthalpy of atomisation than alkali me...

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  10. The correct statement(s) from among the following is/are i) All the ...

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  11. Identify the correct statements (a) In a group the correct order of ...

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  12. d-block elements can act as catalysts due to their ability to

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  13. Incorrect statement reagarding interstial hydrides is

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  14. The properties of Zr and Hf are similar because :

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  15. The stability of particular oxidation state of a metal in aqueous solu...

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  16. Heat of atomization of zinc is lowest among 3d block elements due to

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  17. The positive standard reduction potential of Cu^(2+)/Cu electrode is d...

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  18. The observed and calculated E' values for M^(+2)//M are same for

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  19. Which one of the following is not correct regarding interstitial compo...

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  20. Which one of the following is the correct order of ionic radii?

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