Determine the number of valence electrons in each of the neutral atoms. a. Carbon
b. Nitrogen
c. Oxygen
d. Sulphur
e. Iodine

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form