Self-certification. Employers can also ask employees to fill in a form when they return to work to confirm theyâve been off sick for up to 7 days. This is called âself-certificationâ. Employers usually provide their own version of this form.elf-certification. Employers can also ask employees to fill in a form when they return to work to confirm theyâve been off sick for up to 7 days. This is called âself-certificationâ. Employers usually provide their own version of this form.
Â· just now. 1  The most massive stars (OB stars) have the shortest life. K and M stars are the least massive and have the longest lives. 2  McGarnigle is the most correct here. Type O and B are the hottest, most massive stars and, by virtue of their extreme mass, are the shortest lived.
Here are just a few examples of franciumâs decay paths: Francium-223 is the elementâs longest lived isotope. It has a half-life of 22 minutes. It can emit an alpha-particle (a helium nucleus) to form astatine-219 or a beta-particle to form radium-223. (A beta-particle is an electron which is emitted from a nucleus when a neutron converts to a proton.).