What should be the main focus of a scientist's attention while reaching across a table to pick up a beaker?
calculating how much liquid should be poured into the beaker
considering how liquid in the beaker will react with another liquid
wondering i experimental data is being collected correctly
making sure that there is no other lab equipment in the way

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?

How many neutrons does a atom of cobalt have?

Can someone me with questions 15 to 17 plz.