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Which of the given elements A , B , C , ...

Which of the given elements A , B , C , D and E with atomic numbers 2 , 3 , 7 , 10 and 30 respectively belong to the same period ?

A

A,B,C

B

B,C,D

C

A,D,E

D

B,D,E

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Knowledge Check

  • Which of the following elements A , B , C , D and E with atomic numbers 3 , 11 , 15 , 18 , and 19 respectively belong to the same group ?

    A
    A , B , C
    B
    B , C , D
    C
    A , D , E
    D
    A , B , E

  • Among the elements A,B,C and D having atomic numbers 9,10,11 and 12 respectively the correct order of ionisation energies is

    A
    `A gt B gt C gt D`
    B
    `B gt A gt D gt C`
    C
    `B gt A gt C gt D`
    D
    `D gt C gt B gt A`

  • Among the elements A, B, C and D having atomic numbers 7,8,9 and 12 the element having smallest size is _____

    A
    A
    B
    B
    C
    C
    D
    D

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    An element with atomic number 20 will be placed in which period of the periodic table?

    An element with atomic number 20 will be placed in which period of the periodic table?

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    Which of the following pairs of atomic numbers represents elements belonging to the same group?

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