Q31. Which of the following statements in relation to the solar system is/are correct? (Multiple Select Question) (A) The most abundant elements are H and He. (B) The abundances of elements with atomic numbers 1-50 show an overall decreasing trend. (C) The abundances of heavier elements (atomic number>50) are mostly higher than that of lighter elements (atomic number <50). (D) Elements having odd atomic numbers are more abundant than their immediate neighbours.