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In the short form of the periodic table,...

In the short form of the periodic table, elements are arranged in blockes on the kinds of__________being filled.

A

orbits

B

shells

C

atomic orbitals

D

periods

Text Solution

Verified by Experts

The correct Answer is:
C
Block of the element is decived by the type of atomic orbital receiving the last electron.
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In the modern periodic table, elements are arranged in order of increasing atomic numbers, which is related to the electornic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, p,d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. in accordance with the Aufbau principal, the seven periods (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids, are placed at the bottom of the main body of the periodic table Which of the element whose atomic numbers are given below, cannot be accommodated in the present set up of the long form of the periodic table ?

Knowledge Check

  • In the modern periodic table, elements are arranged in

    A
    increasing mass
    B
    increasing volume
    C
    increasing atomic number
    D
    Alphabetically

  • In the modern long form of the periodic table, elements are arranged in the increasing order of

    A
    atomic mass
    B
    atomic number
    C
    mass number
    D
    isotopic number

  • In the modern Periodic Table, the elements are arranged in

    A
    increasing mass
    B
    increasing atomic volume
    C
    increasing atomic number
    D
    incresing atomic weight
    • R SHARMA-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN ELEMENTS-Follow-up Test 8
    1. In the short form of the periodic table, elements are arranged in bloc...

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