Four blocks of elements in a periodic table refer to various atomic orbitals being filled. What are the four blocks and the corresponding groups in each block ? ( For ex. In s-block we have two groups i. e., group-1 and group-2 )​

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.