Answer:
Pb(No3)2+2Nacl_PbCl2+2NaNO3
Radioactivity another name for radioactive decay. Radioactivity refers to particles emitted from nuclei as a result of nuclear instability.
Answer:- 2,1
Explanations:- Water is 
and from it's formula it is clear that the ratio of H to O moles or atoms is 2:1 means two hydrogen atoms for each oxygen atom. No matter what amount of water we have, the ratio of H atoms to O atoms is always same.
Hence, the answer is 2,1.
The molecular geometry is trigonal bipyramidal.
