Of the choices below, which is the most abundant gas in Earth's atmosphere? Practice
A
argon

B
nitrogen

C
carbon dioxide

D
oxygen

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.

Answer explain why it is not possible to deduce a complete order of reactivity.

Why do lunar and solar eclipse not happen every month