Ryan wants to identify an element. which piece of information would best ryan identify the element?

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

What the blanks in these lines are ?

Achemist who studies water samples did a demonstration of how to test for lead in water. she added a clear solution of potassium iodide to a clear solution of lead nitrate. then a yellow swirling solid formed in the liquid. what is most likely true about the yellow solid?