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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 ?

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`{:(" 1. Its atomic number is 11 " ,, " 2. It is s-block element "), (" 3. It is in 3rd period." ,, " 4 It is in 1st group "), (" 5. Its valency is 1 " ,, " 6. Number of valency electrons are 1 "), (" 7. It can form uni positive ion. " ,, " 8. It can form ionic bond "), (" 9. It is metal " ,,):}`
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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 ?

VGS PUBLICATION-BRILLIANT-STRUCTURE OF ATOM -CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION ( SECTION - III 2 MARKS QUESTIONS )
  1. Explain Hund's rule with an example .

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

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  3. Name the principle , which says an orbital can hold only 2 electrons a...

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  4. For a better understanding about the electrode configuration in an ato...

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  5. Write the electronic configuration of the atom of an element having at...

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  6. Write the 'Octet Rule' . How does Mg (12) get stability while reacting...

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  7. The electron enters into 4 s orbital after filling 3 p orbital but not...

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  8. Write the electronic configuration of Na^(+) and Cl^(-)

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  9. Observe the given table and answer the question Mention the dival...

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  10. Observe the given table and answer the question Name the element ...

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  11. Your friend is unable to understand n l^(x) . What questions will you ...

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  12. Why do valency electrons involve in bond formation , than electrons of...

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  13. What are characteristics of electromagnetic waves ?

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  14. Write Planck's equation .

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  15. Give the equation which give electromagnetic energy (light) that can h...

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  16. Explain Pauli's Exclusion principle with an example.

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  17. Explain Aufbau principle with an example .

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  18. There is an electron in one atom with n = 1, l = O, m(l) = O. a) P...

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  19. Guess the orbital. If 1) It's energy lies in between the energies o...

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  20. The electronic configuration of an atom is as follows 1s^(2) 2s^(2) 2...

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