How many fluorine atoms bond with calcium to form calcium fluoride

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?