Answer
Please see the work below.
Work Step by Step
Similarities between 1s and 2s orbital.
1) Both have a spherically symmetrical shape.
2) Both have the same angular momentum.
Differences between 1s and 2s orbital.
1) They have different size and energy. The size and energy of 2s are greater than 1s.
2) 1s orbital has no nodes whereas 2s orbital has one node.
