✅ Oxygen was discovered by Joseph Priestley in 1774 ✅ Soda water was discovered by Joseph Priestley in 1767 ✅ Radioactivity was discovered by Henri Becquerel in 1896 ✅ X-Ray was discovered by Roentgen 1895 *Follow Whatsapp Channel For Free Prep* *https://whatsapp.com/channel/0029Va8Z3S64IBhBaf7pH51u*