Posted in Web Leaving Cert chemistry: Heavy emphasis on atomic theory June 18, 2019 Leaving Cert chemistry, higher level (a) What are cathode rays? (b) Bananas contain small quantities of potassium?40, a radioactive isotope. What is the daughter nucleus when K?40 emits an … : https://www.irishtimes.com/news/education/leaving-cert-chemistry-heavy-emphasis-on-atomic-theory-1.3929935