Which of these minerals would most likely be valued as a gem and used in jewelry? olivine, a green or gray mineral with a hardness rating of 6.5
gypsum, a pink or white mineral with a hardness rating of 2
galena, a metallic silver mineral with a hardness rating of 2.5
science

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.