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An element has 2 electrons in its K-shel...

An element has 2 electrons in its K-shell. 8 electrons in L-shell, 13 electrons in M-shell and one electron in N-shell. The element is 

A

Cr

B

Fe

C

V

D

Ti

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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) Which is the outermost cell ?

An element X has 3 electrons in the outer most shell of the atom. Write the symbol of its ion.

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 ?

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AAKASH SERIES-ATOMIC STRUCTURE-OBJECTIVE EXERCISE - 2
  1. The number of unpaired electrons present in palladium (Z = 46) atom is

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

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

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  4. Atomic number of the element which has diffe rentiating electron enter...

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  5. The atomic number of an element 'M' is 26. How many electrons are pres...

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

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

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

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

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

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

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

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  13. Given this set of quantum numbers for a multi electron atom 2, 0, 0, a...

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  14. Which of the following isolated gaseous atoms has highest net electron...

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  15. If the Nitrogen atom had electronic configura - tion 1s^(7), it would ...

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  16. Which one of the following sets of quantum numbers is not possible for...

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  17. According to aufbau principle, the correct order of energy of 3d, 4s a...

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  18. The electrons identified by quantum numbers n and I (i) n = 4,l = 1 ...

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  19. Which of the following sets of quantum numbers is correct for an elect...

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  20. Which one of the following represents an impossible arrangement of ele...

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