Answer
See the explanation
Work Step by Step
(a) The element in group 11 and the sixth period is Gold (Au).
(b) An element with atomic number greater than 50 that has properties similar to the element with atomic number 18 (Argon) is Xenon (Xe).
(c) The group number of an element E that forms an ion $E^{2-}$ comes from Group 16.
(d) An element M that you would expect to form the ion $M^{3+}$ is Aluminum (Al).
