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Correct order of radius of the first orb...

Correct order of radius of the first orbit of `H, He^+, Li^(2 +), Be^(3 +)` is :

A

`H gt He^(+) gt Li^(2+) gt Be^(3+)`

B

`Be^(3+) gt Li^(2+) gt He^(+) gt H`

C

`He^(+) gt Be^(3+) gt Li^(2+) gt H`

D

`He^(+) gt H gt Li^(2+) gt Be^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • The ratio of radii of first orbits of H, He^(+) and Li^(2+) is:

    A
    `1:2:3`
    B
    `6:3:2`
    C
    `1:4:9`
    D
    `9:4:1`

  • The radius of the first Bohr orbit for H^(o+) is

    A
    `0.529 Å`
    B
    `0.264 Å`
    C
    `0.132 Å`
    D
    `0.176 Å`

  • The radius of the second Bohr orbit for Li^(2+) is :

    A
    `0.529xx(4)/(3)Å`
    B
    `0.529xx(2)/(3)Å`
    C
    `0.529xx(4)/(9)Å`
    D
    `0.529xx(2)/(3)Å`

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