What part of it are you confused about
A mixture means two or more substances forming into one new substance, look at your answers that you have. Does it show two or more different substances that chemically change into one new substance?
The diaphragm of a microscope that you are using has to adjusted when you need to vary the intensity and the size of the cone of light that is reaching the slide on which you have your specimen.
Answer:
Nobel Gases will have a full p valance shell aswell as a s subshell
Explanation: