In this video, we will discuss the trends in the atomic properties of group-18 elements. We will also discuss its effects on physical properties such as melting and boiling points and also their chemical reactivity. Timestamps 00:16 - What are the group 18 elements? 1:56 - Trends in the ionisation enthalpies of group-18 elements. 2:25 - Electron gain enthalpies of group 18 vs group 17. 4:00 - Atomic radius of group-18 elements. 4:58 - Why noble gases have high melting and boiling points? 5:43 - Chemical reactivity of group-18 elements. Practice this concept - https://www.khanacademy.org/science/class-12-chemistry-india/x6a5fb67b43bb54b9:the-p-block-elements/x6a5fb67b43bb54b9:group-18-elements/e/general-trends-in-the-properties-of-group-18-elements?lang=en Master the concept of “Group-18 elements” through practice exercises and videos - https://www.khanacademy.org/science/class-12-chemistry-india/x6a5fb67b43bb54b9:the-p-block-elements#x6a5fb67b43bb54b9:group-18-elements Check out more videos and exercises on “The p-block elements” - https://www.khanacademy.org/science/class-12-chemistry-india/x6a5fb67b43bb54b9:the-p-block-elements?lang=en To get you fully ready for your exam and help you fall in love with “Chemistry”, find the complete bank of exercises and videos for “class 12, Chemistry” here - https://www.khanacademy.org/science/class-12-chemistry-india?lang=en . Created by Revathi Ramachandran.