![]() Tell students it is these types of observations that inspired early philosophers and scientists and continue to motivate scientist to investigate and explain things they discover in nature. Tell students that many ideas and theories in science change because what is thought to be true changes when new things are discovered. Explain that many objects that appear to be whole are made up of smaller parts.Students will change their initial opinion about the photos. Give students a magnifying glass and ask to re-examine the photos, does the aid of the magnifying glass change their opinion? Students will notice that the print photos are made up of many dots.What do they notice? Do they recognize any differences between the original photos and the print photos? Students will probably recognize the color or sharpness of the photos. Ask students to examine a set of original and print photos without the aid of a magnifying glass.Photographs: Original photos and prints in magazines, you should use color and black and white photos. ![]() The atoms of an element are alike, but they are different than the atoms of other elements. Atoms are the smallest unit of an element that maintains the properties of that element.The first ideas about atoms were the pre-science ideas of Greek philosophers about 2,000 years before modern atomic theory. The atomic theory has changed over time and many scientists are responsible for the information that we know now about atoms.Ideas, theories, and models in science change over time as new information is learned.These are the understandings that the students should have at theend of the lesson and students will be assessed on how well they understandthese objectives. Introduce the Lesson Objectives: Teacher should make specific the learning goals forthis lesson. Teacher should accept all response with minimal comments or corrections Several students can share their journal entry.Students write a journal response to the question: What is an atom and how do we know it exists?.*Before: This a warm-up to the lesson and should take about 5 minutes It is hard for students to believe that all matter ismade up of atoms, that atoms are in constant motion and that they are too smallto observe through a microscope. They oftenbelieve that atoms have the macro properties of matter such hardness, color,shape, or stickiness. Misconceptions: The middleschool student has difficulty understanding the structure of matter. ![]() Vocabulary: atom, electron, nucleus, and electroncloud
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