CK-12 Physical Science Concepts - For Middle School

2.27. Amontons’ Law http://www.ck12.org How can you tell that air pressure inside the can is lower after the can cools? Review ...

http://www.ck12.org Chapter 2. Matter FIGURE 2.50 ...

2.28. Atoms http://www.ck12.org 2.28 Atoms Describe atoms and how they are related to elements. Identify the three main subatom ...

http://www.ck12.org Chapter 2. Matter Size of Atoms Unlike bricks, atoms are extremely small. The radius of an atom is well unde ...

2.28. Atoms http://www.ck12.org FIGURE 2.52 Model of a helium atom. Q:Lithium has three protons, four neutrons, and three electr ...

http://www.ck12.org Chapter 2. Matter FIGURE 2.53 How is the hydrogen atom different from the atoms of all the other elements t ...

2.29. Atomic Nucleus http://www.ck12.org 2.29 Atomic Nucleus Identify the nucleus of the atom. Describe the size and mass of th ...

http://www.ck12.org Chapter 2. Matter FIGURE 2.54 http://www.youtube.com/watch?v=1o-FsxAkvZk (1:06) MEDIA Click image to the lef ...

2.29. Atomic Nucleus http://www.ck12.org nuclear force—holds protons and neutrons together in the nucleus. You can learn more ab ...

http://www.ck12.org Chapter 2. Matter Review Describe the nucleus of the atom. Why is the nucleus positive in charge? Explain w ...

2.30. Protons http://www.ck12.org 2.30 Protons Describe protons. State the relationship between protons and elements. Identify ...

http://www.ck12.org Chapter 2. Matter MEDIA Click image to the left for use the URL below. URL: http://www.ck12.org/flx/render/e ...

2.30. Protons http://www.ck12.org FIGURE 2.55 Vocabulary proton: Positively charged atomic particle inside the nucleus of an at ...

http://www.ck12.org Chapter 2. Matter 2.31 Neutrons Describe neutrons. Explain how isotopes of an element differ from one anoth ...

2.31. Neutrons http://www.ck12.org http://www.youtube.com/watch?v=Vi91qyjuknM (7:44) MEDIA Click image to the left for use the U ...

http://www.ck12.org Chapter 2. Matter Same Element, Different Numbers of Neutrons All the atoms of a given element have the same ...

2.31. Neutrons http://www.ck12.org Vocabulary neutron: Electrically neutral atomic particle inside the nucleus of an atom. Exp ...

http://www.ck12.org Chapter 2. Matter 2.32 Electrons Describe electrons. Explain where electrons are found in atoms. Describe e ...

2.32. Electrons http://www.ck12.org Properties of Electrons Electrons are extremely small. The mass of an electron is only about ...

http://www.ck12.org Chapter 2. Matter dumbbells, with the nucleus in the pinched part of the dumbbell. You can see animated, thr ...