Which atom is not an isotope of krypton?
Number of neutrons: 484848, Mass number: 848484
Number of neutrons: 505050, Mass number: 868686
Number of neutrons: 474747, Mass number: 838383
Number of neutrons: 464646, Mass number: 838383
7 exam-style questions on OCR A A Level Chemistry Atomic structure and isotopes. Each one has a worked solution and a mark scheme showing where the marks go.