The invention of the printing press increased the _ rate in fifteenth-century Europe. This invention made books more _ because they could be produced in larger quantities.

Literacy, affordable

Explanation:

The increased use of books helped people to be more literate, and because there was more books, they weren't as "rare" and were therefore more common and cost less money.

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.