Answer:
16 is (1)
17 is (4)
18 is (3)
19 is (2)
Explanation: 16 is right because the barium always loses 2 electrons
17 is right because Ge is gold
18 is right because As has 72.922 larger than Ge 72.64
19 is right because 2 is a noble gas an 13 is post-transition metal an 14 is a metalloid
