Question

which of the following will have same radius as first shell of hydrogen atom

a.n=2 , lithium
b.n=2 , beryllium
c.n=2, helium
d.n=3, helium​

Answer 1

Explanation:

5

cm. The left margin is

cm and the right

15 The width of a page of a newspaper is

4

16

from

cm. What is the width of the page inside the

Answer 2

As we know that,

r=r

0

Z

n

2

whereas,

r

0

= radius of 1

st

Bohr's orbit of hydrogen atom =0.529

A

˚

For r=r

0

-

Z

n

2

=1

⇒n

2

=Z.....(1)

∵ For n=2,Be

+3

,

Z=4, which satisfies equation (1).

Hence, n=2,Be

+3

will have the same radius of 1

st

Bohr's orbit of a hydrogen atom.