Answer:
![\Delta t = 13\,h](https://tex.z-dn.net/?f=%5CDelta%20t%20%3D%2013%5C%2Ch)
Explanation:
Half time is period required to desintegrating the half of the initial number of atoms. Then, the total time is:
![\Delta t = 5\cdot (2.6\,h)](https://tex.z-dn.net/?f=%5CDelta%20t%20%3D%205%5Ccdot%20%282.6%5C%2Ch%29)
![\Delta t = 13\,h](https://tex.z-dn.net/?f=%5CDelta%20t%20%3D%2013%5C%2Ch)
Answer:
boron aluminum gallium indium
Explanation:
hope this helps you
I think it is polymer B because polymer B has the same structure and the right elements in the right place.