What would the value of the associated decay constant be?

[nerdgirl]

Homework Statement

If a numerical value had to be assigned to the half life of ²⁷Al, what would that value be? What would the value of the associated decay constant be? What does this mean about the activity of ²⁷ Al?

Homework Equations

The Attempt at a Solution

Since it is a stable, you have to look at the chart of the nuclides to compare. You have ²⁷Si that B⁺ to ²⁷Al with a half life of 4.14 s and you have ²⁷Mg that B^- decays to ²⁷Al with a half life of 9.45m. I am confused about the first part of the question. Any advice?

 

[Redbelly98]

Welcome to PF.

If it is stable, it never decays, ever. One might say that it's lifetime is ____?