Pls hlp me with these questions: brainliest, ratting, thx, etc.

What is the lowest number energy level where a d sublevel is found

Aconcentrated solution of ammonia is 14.8m and has a density of 0.899g/l. what is the concentration of ammonia in this solution in weight percent (%w/w)?

Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved