Unit 4 Lesson 6 What Is the Atomic Theory? Copyright © Houghton Mifflin Harcourt Publishing Company 1

Unit 4 Lesson 6 What Is the Atomic Theory? Florida Benchmark SC.5.P.8.4 Explore the scientific theory of atoms (also called atomic theory) by recognizing that all matter is composed of parts that are too small to be seen without magnification. Copyright © Houghton Mifflin Harcourt Publishing Company 2

Unit 4 Lesson 6 What Is the Atomic Theory? A Teeny Tiny Theory Substances can be broken down into increasingly smaller units. An atom is the smallest unit of a pure substance that has the properties of that substance. The atomic theory is a scientific explanation of the structure of atoms and how they interact with other atoms. Copyright © Houghton Mifflin Harcourt Publishing Company 3

A Teeny Tiny Theory Atoms are the building blocks of all matter. Unit 4 Lesson 6 What Is the Atomic Theory? A Teeny Tiny Theory Atoms are the building blocks of all matter. Current atomic theory states that an atom is mostly empty space. At the center of an atom is the nucleus. Copyright © Houghton Mifflin Harcourt Publishing Company 4

Unit 4 Lesson 6 What Is the Atomic Theory? A Teeny Tiny Theory A proton is a positively charged particle found in the nucleus of an atom. A neutron is in the nucleus of an atom, but a neutron has no charge. An electron is a negatively charged particle that speeds through the area around the nucleus called the electron cloud. Copyright © Houghton Mifflin Harcourt Publishing Company 5

A Teeny Tiny Theory Identify the parts of the atom. Unit 4 Lesson 6 What Is the Atomic Theory? A Teeny Tiny Theory Identify the parts of the atom. Copyright © Houghton Mifflin Harcourt Publishing Company 6

Unit 4 Lesson 6 What Is the Atomic Theory? It’s Elementary! An element is a type of matter made of just one kind of atom. All atoms of an element have the same number of protons. Examples of elements include neon, mercury, chlorine, silver, and copper. Copyright © Houghton Mifflin Harcourt Publishing Company 7

Putting It All Together Unit 4 Lesson 6 What Is the Atomic Theory? Putting It All Together A compound is a substance formed from at least two types of atoms that are chemically combined. The properties of a compound are often different from the properties of the elements that form it. Copyright © Houghton Mifflin Harcourt Publishing Company 8

Putting It All Together Unit 4 Lesson 6 What Is the Atomic Theory? Putting It All Together Which substances are elements? Which substances are compounds? Copyright © Houghton Mifflin Harcourt Publishing Company 9