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March 24, 2017

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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

  • Chemistry - ,

    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.

  • Chemistry-Is this correct, please and thank you - ,

    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

  • Chemistry - ,

    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.

  • Chemistry - ,

    Thanks Dr. Bob

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