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[Music] hello and welcome to this video on group 2 and this is for OCR a my name is Chris Harris and Im from Ali we tutors calm and basically this video is a very quick overview of the group two bits that you need to know for the OCR a specification and the slides that Im using here they can be purchased if you want to copy them for revision just click on the link in the description box below this video and youll be able to get them from there but yet like I say this is very tailored specifically for OCR a and here are the specification points from the OCR syllabus and basically everything in this PowerPoint will well cover these specification points okay so this is all about group 2 so were going to look at the atomic radius first of these elements so group 2 elements they form plus 2 ions when they react which makes kind of sense so they all lose two electrons to form two plus ions and all group 2 metals have an electron configurations that end in s2 so lets have a look at the