... > chemical entity > molecular entity > main group molecular entity > s-block molecular entity > alkaline earth molecular entity > alkaline earth coordination entity > calcium coordination entity > hexaaquacalcium(2+)

... > chemical entity > molecular entity > polyatomic entity > heteroatomic molecular entity > coordination entity > main-group coordination entity > alkaline earth coordination entity > calcium coordination entity > hexaaquacalcium(2+)

... > chemical entity > molecular entity > main group molecular entity > main-group coordination entity > alkaline earth coordination entity > calcium coordination entity > hexaaquacalcium(2+)