6= atom
1=mass
2=matter
3=weight
4=compound
5=molecule
Hoops this help
Answer:
pure substance : lead ( Pb )
mixture substance : nitrogen ( N )
The formula SF_2 expresses one-third the amount of F.
The F:S ratio in the first compound is 6:1.
We want a compound with one third the amount of F, so F:S = 2:1.
The simplest formula with this ratio is SF_2.
He concluded that all tissues are made up of cells.