CK-12 Physical Science Concepts - For Middle School

2.32. Electrons http://www.ck12.org FIGURE 2.60 A:The atom will have two electrons at the first energy level, eight at the secon ...

http://www.ck12.org Chapter 2. Matter http://www.aip.org/history/electron/jjhome.htm Who discovered electrons? When were they ...

2.33. Fundamental Particles http://www.ck12.org 2.33 Fundamental Particles Outline the search for fundamental particles. Compar ...

http://www.ck12.org Chapter 2. Matter particles together?” The quest for fundamental particles began thousands of years ago. Sci ...

2.33. Fundamental Particles http://www.ck12.org TABLE2.7:(continued) Year Discovery 1911 Ernest Rutherford discovers the proton, ...

http://www.ck12.org Chapter 2. Matter Leptons and Quarks and Bosons, Oh My! Today, scientists think that electrons truly are fun ...

2.33. Fundamental Particles http://www.ck12.org carrying fundamental particles. The different types of bosons and the forces the ...

http://www.ck12.org Chapter 2. Matter Scientists think that a different type of boson carries each of the four fundamental forc ...

2.34. Atomic Forces http://www.ck12.org 2.34 Atomic Forces Describe electromagnetic forces within the atom. Explain how the str ...

http://www.ck12.org Chapter 2. Matter Inside the atom, two types of subatomic particles have electric charge: electrons, which h ...

2.34. Atomic Forces http://www.ck12.org FIGURE 2.63 The types of quarks found in protons and neutrons are called up quarks (u) a ...

http://www.ck12.org Chapter 2. Matter A:The resulting atom represents a different element. That’s because each element has a uni ...

2.35. Atomic Number http://www.ck12.org 2.35 Atomic Number Define atomic number. Explain what mass number represents. Athletes ...

http://www.ck12.org Chapter 2. Matter FIGURE 2.65 Atomic Number The number of protons in an atom is called itsatomic number. Thi ...

2.35. Atomic Number http://www.ck12.org Mass Number There is another number in theFigure2.66 for helium. That number is themass ...

http://www.ck12.org Chapter 2. Matter http://images.pcmac.org/SiSFiles/Schools/AL/BaldwinCounty/SpanishFortMiddle/Uploads/Forms ...

2.36. Ions http://www.ck12.org 2.36 Ions State why atoms are neutral in electric charge. Describe ions. Explain how ions form. ...

http://www.ck12.org Chapter 2. Matter Consider the example of fluorine (seeFigure2.67). A fluorine atom has nine protons and nin ...

2.36. Ions http://www.ck12.org the positive nucleus. However, most ions form when atoms transfer electrons to or from other atom ...

http://www.ck12.org Chapter 2. Matter Vocabulary ion: Positively or negatively charged form of an atom that has lost or gained ...