Atoms are tiny particles of matter that are made up of three particles:
protons, neutrons, and electrons. The Element Builder Gizmo shows
an atom with a single proton. The proton is located in the center of the
atom, called the nucleus.
1. Use the arrow buttons ( ») to add protons, neutrons, and electrons
to the atom. Press Play ( >).

A. Which particles are located
in the nucleus?

B. Which particles orbit around
the nucleus?

C. Turn on Show element
name. What causes the
element name to change?

Protons: 1
Neutrons: 0
Electrons: 0