Question

page 3 – atoms & elements
all matter is made of tiny particles called ________.
at the center of each atom is the ______, which contains ____ and ______.
negatively charged particles that move around the nucleus are called ________.
an element is a pure substance made of only one kind of ________.
sometimes atoms combine to form more complex substances. a compound is a substance made of two or more ______ chemically combined. for example, water (h₂o) is a compound made of ____ and ______.
not all substances are compounds—some are mixtures. a mixture is made of substances that are ______ combined but not ____. saltwater is an example of a ____ mixture because it looks the same throughout, while a salad is an example of a ______ mixture because you can see the different parts.

Explanation:

Answer:

1. atoms
2. nucleus; protons; neutrons
3. electrons
4. atom; atom
5. elements; hydrogen; oxygen
6. physically; chemically combined; homogeneous; heterogeneous