nitrogen is an element, not a compound.
Silver is an elemement Ans 2 -Silver alloy is a mix of silver and another metal. It is not an element.
I will post a link to a video I made on how to change the cabin filter on the 2003-up Accord. It is the same for your Element. Just watch the video.
Atoms are one element only. A stable molecule can only have one element if it is a diatom or a network of carbon for instance (diamond). Molecules have generally 2 or more elements.
The repitation of physical and chemical properties of elements periodically is called periodicity