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Elements of group 18 are known as noble ...

Elements of group 18 are known as noble gases because

A

Chemically inactive, but react with few elements under certain conditions

B

Except Rn, all others occur in the atmosphere of which Ar is the major element

C

He and Ne don't form clathrate compounds

D

Noble gases have comparatively large size

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Knowledge Check

  • Hydrides of elements of Groups 3–5 are generally called

    A
    interstitial hydrides
    B
    ionic hydrides
    C
    polymeric hydrides
    D
    complex hydrides

  • Hydrides of elements of Groups 3–5 are generally called

    A
    interstitial hydrides
    B
    ionic hydrides
    C
    polymeric hydrides
    D
    complex hydrides

  • Persons with blood group 'O' are universal donors because they have

    A
    Antigen 'A' on RBCs
    B
    Antigen 'B' on RBCs
    C
    No antigen on RBCs
    D
    Antigens 'A' and 'B' on RBCs

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    Complete the given statements by choosing the appropriate answer from the bracket. (Transistion elements, 18th group, Alkali metals, rare earths, 1st group) a) ….............. elements are known as noble gases. b) The elements showing similarities in chemical properties in groups and periods are known as ................ c) Lanthonoids are also called as .................

    Elements in the groups 13 to .18 in the' periodic table constitute the ‘p’ block elements. In general, noble gases are least reactive. Why?

    The first element of a group in the periodic table of elements after shown the ressemblance to the second element of the neighbouring group on the right, which is.

    The Elements of group 14 show ----- oxidation states

    Give reasons for the following:- i. elemental phosphorus does not exist as P_2 molecule ii. Noble gases are known as Inert gases.

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