(a) The symbol and group number of the Period 7 transition element whose atoms have the fewest protons are (a) and (b) .
(b) The elements in Group 6A(16) are sometimes called the chalcogens. The symbol and atomic number of the only metallic chalcogen are (a) and (b) .
(c) The symbol and number of protons of the Period 4 alkali metal atom are (a) and (b) .