Which sublevel represents both alkali and alkaline earth metals

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

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.