Physical Science 7.5a - Nuclear Fission - Part 1

[Chirag1496]

Sir, why there is a variety of Mass numbers given for the products after the fission reaction? One book says - Krypton : 94 , Barium 139

Wikipedia says : Krypton 92 , Barium 141... ?

[derekowens]

@Chirag1496 I'm not sure, but I do know that these reactions are typically more complicated down at the subatomic particle level than is typically conveyed in the simple equations that just state the start and end products. There may be more than one way for that particular reaction to unfold. Just guessing at the moment, though.

[TheDevilvivek]

from where does neutron came can anyone tell me please

[LokiClock]

@TheDevilvivek Correction: "From where does it come?" You're thinking of "(from) whence it came."

[dracd235]

YouTube's best tutorial vids on the subject = 7.5a & 7.5b - thanks a whole lot

[missmolly77777770]

lisa meitner was austrian; not german :)

[derekowens]

@missmolly77777770 Thanks, miss Molly! I'll put that on my list of things to fix...

DO

[ladylaurenmo]

Bravo! This video has been very helpful to me as a teacher, trying to branch into nuclear chemistry to a small curious 7th grade class!

[kateclaudia]

that was great - I only have one critique - Rutherford did that in 1890 though, not 1990 - he died in 1937 ...

[derekowens]

@kateclaudia Whoops! Did I say 1990? Definitely my mistake. 1890 would be correct rather than 1990. Thanks.

[Aniihya]

@derekowens no you said 1919 not 1990

[derekowens]

@Aniihya Yes, thanks. Just looked it up again.  1919 is correct. Thanks.

[olivier12125]

@kateclaudia douchbag he said 1919 cunt nugget

[kateclaudia]

@olivier12125: Yes my mistake I am afraid I misheard him :) Sorry about that derekowens I didn't mean to be rude.  Thanks mate.

[rugalevv]

The best explanation of the nuclear fission I´ve ever seen in textbooks and the Internet. Thank you, greetings from Russia.

[xgoldensunshinex]

Thnx :)

[Ninjax111]

Your explanations beat all teachers!

I understood straight away, thanks.

[absbgirl]

This is the most amazing series I have seen. I know all about necleus, atoms, and electromagnetic decay. Thanks, Derek, you need to post more, maybe noise, pH levels, etc.

Thanks again, you're the best

[8121950]

In the formula below that resumes the fission reaction,the mass numbers of Krypton and barium shoulde be 55 and 86 respectively.

[DeJayHank]

isn't the mass number the total amount of neutrons+protons? 55+36=91 and 56+86=142, just like he wrote there.

you can only get the number of neutrons (55 and 86) by subtracting the atomic number from the mass number.

[ScienceScott]

Great Video, thanks!