Answer:
Similarities: (i) Both have
spherical shape (ii) Both have same angular momentum as it is\[=\sqrt{l(l+1)}\frac{h}{2\pi
}\].
Differences. (i) 1s has no node while 2s
has one node. (ii) Energy of 2s is greater than that of 1s.
(iii) Size of 2s is larger than
that of 1s.
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