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)

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

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

The nucleus is the positively charged center of the atom

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

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

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

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

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”

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