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""(21 ) Sc : 1s^(2 ) 2s ^(2) 2p ^(6) ...

`""_(21 ) Sc : 1s^(2 ) 2s ^(2) 2p ^(6) 3s^(2)3p ^(6 ) 4s ^(2) 3d^(1)`
Scandium belongs to which block ?

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""_(11)Na :1s ^(2) 2s^(2) 2p ^(6) 3s^(1) this element belongs to which block ?

1s^(2) , 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(10) . Which rule is violated ?

""_(11)Na=1s^(2) 2s^(2)2p^(6) 3s^(1) ""_(21) Sc=1s^(2)2s^(2)2p^(6) 3s^(2)3p^(6) 4s^(2)3d^(1) Which one can form cation rasily ? Why ?

Sc = 1s^2 2s^2 2p^6 3s^2 3p^6s 4s^2 3d^1 .this is belongs to

""_(11)Na=1s^(2) 2s^(2)2p^(6) 3s^(1) ""_(21) Sc=1s^(2)2s^(2)2p^(6) 3s^(2)3p^(6) 4s^(2)3d^(1) Write the group and periods of the given elements.

What is valency of 1s^2 2s^2 2p^6 3s^2 ?

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 ?

A: 1S^(2) 2S^(2) B: 1s^(2) 2s^(2) 2p^(6) 3^(2) To which group element 'B ' belongs ?

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) What is the atomic number of element ?

VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS -THE PERIODIC TABLE -CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION (SECTION -I)
  1. How many blocks are there in modern peridic table ?

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  2. ""(11)Na :1s ^(2) 2s^(2) 2p ^(6) 3s^(1) this element belongs t...

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  3. ""(21 ) Sc : 1s^(2 ) 2s ^(2) 2p ^(6) 3s^(2)3p ^(6 ) 4s ^(2) 3d^(...

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  4. What is the general outersheell electronic configuration of alkal...

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  5. What is general outershell electronic configuration of Halogen ...

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  6. match the above

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  7. Which statement is wrong ?

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  8. How many elements are there in first period in the periodic tab...

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  9. which block elements are called Lanthanoids / actinoids ?

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  10. match it {:("a)",""(58)Ce-""(71)Lu,"i) Actinoids "),("b)",""(90) ...

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  11. Which block elements are called as transition metals ?

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  12. Which block elements are called the inner transition elements ?

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  13. Give two example to semi conductors?

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  14. Which block contains metals only ?

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  15. TO which group Lanthanoids and actinides belongs ?

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  16. Who did experiments to calculate the number of positive charges ...

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  17. A: Elements along a period possess different chemical properties...

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  18. Which property of an element is called as combining power of it...

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  19. In NaH , what is the valency of 'Na' ?

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  20. In CaO, what is the valency of 'Ca' ?

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