Nerve gases (also known as nerve agents) are a class of chemical weapons. During Day 5, the terrorist group known as the Dawn Brigade (led by Vladimir Bierko) used a stolen nerve gas called Sentox to threaten America.
the number of words in a novel will vary depending on the genre a young adult novel will run between 20000 and 40000 words that would be the length of a novella in mainstream fiction many genres seem to have succumbed to supersizing a mass market western mystery or sf novel used to run to 60000 70000 words
The other thing is that chapter lengths are important if you want to keep your book on the straight and narrow, otherwise you'll end up with a tome thicker than a tectonic plate and busting 800,000 words. This is why writers vary chapter length, so they can keep within the 80K, 90K or 100K words of the average novel.