What is the mass number of an atom having 16 protons and 13 neutrons?

What is the correct lewis structure for chloroform chcl3

Why are pipes bursting in the in extremely cold weather?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?