1. Atom p. 88 The smallest unit of an element How small are they?
A penny is made up of about 2 x 10 ²² power of atoms
20,000,000,000,000,000,000,000 (copper and zinc atoms)

2. What is an atom made of? Go to the next set of slides
and we’ll find out!

3. We call the parts of
an atom “sub-atomic”
particles.

4. The nucleus is the
positively charged
center of the atom

5. The proton is a positively
charged particle in the
nucleus of an atom

6. The neutron is neutrally charged particle in the nucleus of an atom
No Charge

7. The electron is a negatively charged particle outside the
nucleus of an atom
p. 89

8. Quiz questions 1. What is the center of the atom called? The nucleus
2. What is the charge of a proton?
Positive
3. What is the charge of an electron?
4. What is the charge of a neutron?
Negative
Neutral or “no charge”
5. Where are the protons and neutrons located?
In the nucleus

9. The electron is found around the nucleus in electron clouds p. 90
Atoms have an
equal number
of protons and
electrons so they
have no charge.
If an atom gains or loses its
electron, it is called an “Ion”

10. Tomorrow we will..
Compare atoms of different elements 1. 2. 3.