An electron in the first energy level of the electron cloud has an electron in the third energy level.

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

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.

What produces wave a)sound b) heats c)transfer of energy d)vibrations