Question

match the vocabulary word to its definition. smallest unit of an element a. nucleus b. atom a subatomic particle with a negative charge c. electron center of an atom

Explanation:

An atom is the smallest unit of an element. An electron is a subatomic particle with a negative charge. The nucleus is the center of an atom.

Answer:

1. smallest unit of an element - b. atom
2. a subatomic particle with a negative charge - c. electron
3. center of an atom - a. nucleus