Question

identify the elements and compounds from the following
a.sodiam
b.water
c.ammonium 
d.calcium carbonate 
e.methane ,
f.lead

Answer 1

a.Sodium is an element and it' symbol is Na
b.water is a compound because it consist of hydrogen and oxygen molecules.it's symbol is H2O

c. ammonium is a compound and it's formula is NH4
d. calcium carbonate is a compound and it's formula is CaCo3 
e.methane is a compound and its formula is CH4
f. lead is a element and it's symbol is Pb

               Hope this answer help's you..................Thank you

Answer 2

a. Sodium is an element b. Water is a compound c. Ammonium is a radical compound d. Calcium carbonate is a compound e. Methane is a compound f. Lead is an element