Is Tungsten magnetic? I dropped my boyfriends ring (made of Tungsten) down the place in the doorframe where the door closes, not knowing there was actually a hole there.
Use commas to separate things in a list or series. If you have a series of three or more items, use commas to separate each item. Do not place commas before or after the list or series. Do not use commas when all the items in a series are linked by and, or, or nor.
Use Commas to Join Two or More Independent Clauses. Use Commas to Join Two or More Independent Clauses was written by Joseph Moxley, University of South Florida. In most instances, place a comma between two sentences that are joined with a coordinating conjunction--and, but, or, for, nor, so, yet: She was not sure if she had the necessary mathematical abilities to be an engineer, so she pursued a graduate degree in history.