For an hydrogen-like atom with Z=3 what is the wavelength of the photon corresponding to the transition 2-->3?

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

What element has similar physical and chemical properties as boron.

What is the full form of icc in chemistry?