You are given 500 mL of a 5M stock solution of ammonium chloride but for your experiment, you only need 100 mL of a 0.65M solution. Explain how to make the solution you need?

13ml

Explanation:

to prepare dis solution first you need a volumetric flask of 100ml calibrated .using dilution formulae u will need 13ml from the stockmeasure 13ml of the 5M stock of the 500mlthen drop it into the 100ml calibrated flask then add water till it reach d mark and you shake thoroughly

They are all full and don't need any more electrons in there outer shell.