Which statements about the periodic table's organization are true? select all that apply. the periodic table is organized by atomic number. the periodic table is organized by reactivity. the periodic table is organized by atomic mass. the periodic table is organized by families. the periodic table is organized by periods and groups.

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.