One isotope of nitrogen has 7 protons and 8 neutrons. which is the correct reference for this isotope? a. nitrogen-8 b. nitrogen-7 c. nitrogen-15 d. nitrogen-1

To create electromagnetic induction, which of the following has to move? a. a wire b. a magnet c. a transformer d. either a or b

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match