Hi Ally,
The Validate Scope process is part of the Monitoring and Controlling Process Group rather than the Closing Process Group, so you can eliminate that item. The Exam Content Outline does provide some of the tasks involved with project closure. Additionally, activities related to project closure can be found on page 123 of the PMBOK® Guide. As far as the order of activities, it is difficult to establish a concrete sequential order. We need to keep in mind that some of these activities will likely occur concurrently rather than sequentially. Additionally, the needs of the project will influence the order of activities as well. As far as "letting go of resources", the project manager would likely release resources throughout the closing process when they are no longer needed. However, at least some subset of the project team must remain assigned to the project until all of the activities related to project closure have been completed. After all, if the entire project team has been released before the project has been closed, there is no one available to perform any remaining closing activities. Therefore, I would argue that releasing any remaining project team members would probably be the last thing to do.
Donald Terry, MBA, PMP, PMI-ACP
Full disclosure: I work for OSP International as an independent contractor
