# Chemistry

posted by Aubrey

What are the equations for the following?
Positron emission from silicon-26
and
Sodium-22 undergoes electron capture

I really don't get it
Thank you

1. DrBob222

All you really need to know is two things.
1. Can you add and subtract up to 2.
2. Do you know the mass and charge of particles?
A positron is a + electron, and we show it as 1e^0 where the 1 is the charge and the ^0 is the mass of zero. The subscripts must and the superscripts must add. The number appearing before is the subscript and the number with a caret after is a superscript.
16Si^26 ==> 1e^0 + 15X^26.
Note that 16 on the left equals 1 +15 on the right.(I got the 15 by 16-1=15). The 26 on the left equals ) + 26 on the right. I don't know what X is, now I look on the periodic table and I see that element number 15 is P and I can erase X and replace it with P.

For electron capture, we have
11Na^22 + -1e^0 ==> I will let you do this one. Just make the numbers on the right add to those on the left.

2. Aubrey

Positron Emissionfrpm silicon -26 would be:
26/14Si (arrow) Al + 0/+1 e

Sodium-22 undergoes electron capture
22/11Na + 0/-1e (arrow) 22/10Ne

3. DrBob222

You are absolutely correct. And I'm glad to saw I didn't read the atomic number of Si correctly. It is 14 big as life and not 16. Eyes again.

4. Aubrey

Thanks Dr. Bob

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