What are the similarities and differences between 1s and 2s orbital?

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Solution

Differences
S No. $1 s - orbital$ $2 s - orbital$
1 There is absence of radial node at the center There is presence of radial node at the center making the radius of the shell large.
2 There is only one most probable region. There are two most probable region.
3 It is smaller in size and has less energy. It is larger in size and has large energy.
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Similarities
S No. $1 s - orbital$ $2 s - orbital$
1 These orbitals are spherically symmetrical These orbitals are spherically symmetrical
2 They occupy two electrons. They occupy two electrons.

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S No.	$1 s - orbital$	$2 s - orbital$
1	There is absence of radial node at the center	There is presence of radial node at the center making the radius of the shell large.
2	There is only one most probable region.	There are two most probable region.
3	It is smaller in size and has less energy.	It is larger in size and has large energy.
4