Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements? An electron is 2000 times lighter than a hydrogen atom.
Charge-to-mass ratio of electrons was the same, regardless of the gas used.
Cathode rays are negatively-charged particles.
Cathode rays can be deflected by magnets.

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.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

What state of matter is ice a. liquid b. element c. solid d. gas