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Nordic Countries

June 2011

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Nordic Countries

Can someone help me on Chemistry?

It basically says: Write a nuclear equation for the alpha decay of 231 91 (231 on the top, 91 on the bottom) Pa.

Also, there's another question: Write a nuclear equation for the beta decay of 223 87 Fr.

If someone could help me before Monday...? I don't understand anything about this. :(


it would be, using the numbering format you've used:

213 91 Pa -> 4 2 He + 209 89 Ac

223 87 Fr -> 0 -1 e + 223 88 Ra

Basically it's like this: there are four main types of radioactive decay: alpha emission, beta decay, positron emission, electron capture. (there's also gamma emission but eh it's not as important).

An alpha particle is a helium nucleus, which is why it is 4 2 He. A beta particle is an electron that comes from a nucleus. Positron is an electron that has a positive charge instead of a negative charge. And electron capture is when an electron is captured from the energy level closest to the nucleus. From there, you balance it like any equation.

Hope this made sense!
So for the alpha decay, would it be 4 2 He regardless of the element (Pa, Sm, Gd, etc.?)

And the beta decay will always be (final element) -> 0 -1 e + (other element)?
Yes. Alpha particles are helium particles, and beta particles are electrons. The only thing that changes is whatever element that is experiencing decay.
You, my dear, are a life saver. ilu~ ♥♥♥♥♥♥♥♥

But seriously, thanks. It makes a whole bunch more sense.
Btw, do you look at top number to decide the element, or the bottom number?
The top number is the atomic mass; the lower number is the atomic number. If the element is neutral, the atomic number indicates the number of protons (and also electrons) it has. And the atomic mass will be equal to the sum of the protons and neutrons.
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То ли в википедии, то ли еще где я уже читал почти такую же подборку данных!