Atoms, Elements, Compounds, and the Periodic Table

What is too small to be seen by the human eye, but can be seen through a microscope?

What is made up of two or more particles?

The atomic number of an atom is the number of _______ in an atom.

Which part of an atom has no charge?

What is a pure substance that is a building block of matter?

Which part of the atom is not in the nucleus?

All of the elements in the universe have been discovered.

Which of the following are compounds?

This tool is organized into groups with similar chemical properties:

The atomic weight is the number of _______ and ________ in an atom.

Which part of an atom has a positive charge?

What is the center of an atom called?

What parts of an atom are in the nucleus?

Which part of an atom has a negative charge?

What is the smallest particle of matter?