All books vary on words, especially in a teen's novel. The average words from 60,000 words to 200,000 or more words in a whole novel. For example, if your book has about 20 chapters, you can put about 10,000 words in each chapter.
Each chapter is as long as you want it to be -- you're the writer! You put in as many words as you need to explain the first scene or scenes in your book.
Varies according to the book (Order of the Phoenix is by far the longest), but the average chapter in Philosopher's Stone, for example, is between 3,500 and 5,000 words.
C H A P T E R apt, ate, ace, at, are, ape, art, arch, act, car, cart, care, cat, cape, crape, crap, chap, chart, cap, chart eat, ear, each, earth hat, hate, heart, her, heat, harp. hear, hearth pa,...