Matter 2.1<br />
Element<br />A substance that cannot be broken down into simpler substances by ordinary chemical or physical means.<br />
Atomic Number<br />The number of protons in the nucleus of an atom.<br />
Energy Level<br />One of several distinct regions around the nucleus of an atom where electrons are located.<br />
Isotope<br />An atom with the same number of protons but different numbers of neutrons for a given element; an isotope’s m...
Mass Number<br />The number of neutrons and protons in the nucleus of an atom.<br />
Compound<br />A substance formed by the chemical combination of two or more elements in definite proportions and usually h...
Chemical Bond<br />A force that holds together atoms that form a compound.<br />
Ion<br />An atom or a molecule that possesses an electrical charge.<br />
Ionic Bond<br />A bond that forms between negative and positive ions.<br />
Covalent Bond <br />A bond that forms when atoms share electrons.<br />
Metallic Bond<br />A bond that forms when electrons are shared by metal ions.<br />
Key Concept<br />What is an element?<br />An element is a substance that cannot be broken down into simpler substances by ...
Key Concept<br />What particles make up atoms?<br />An atom is the smallest particle of matter that contains the character...
Key Concept<br />What are isotopes?<br />Atoms with the same number of protons but different numbers of neutrons are isoto...
Key Concept<br />What are compounds and why do they form?<br />A compound is a substance that consists of two or more elem...
Key Concept<br />How do chemical bonds differ?<br />When an atom’s outer-most energy level does not contain the maximum nu...
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Earth Science 2 1

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Earth Science 2 1

  1. 1. Matter 2.1<br />
  2. 2. Element<br />A substance that cannot be broken down into simpler substances by ordinary chemical or physical means.<br />
  3. 3. Atomic Number<br />The number of protons in the nucleus of an atom.<br />
  4. 4. Energy Level<br />One of several distinct regions around the nucleus of an atom where electrons are located.<br />
  5. 5. Isotope<br />An atom with the same number of protons but different numbers of neutrons for a given element; an isotope’s mass number is different from that of the given element. <br />
  6. 6. Mass Number<br />The number of neutrons and protons in the nucleus of an atom.<br />
  7. 7. Compound<br />A substance formed by the chemical combination of two or more elements in definite proportions and usually having properties different from those of its constituent elements.<br />
  8. 8. Chemical Bond<br />A force that holds together atoms that form a compound.<br />
  9. 9. Ion<br />An atom or a molecule that possesses an electrical charge.<br />
  10. 10. Ionic Bond<br />A bond that forms between negative and positive ions.<br />
  11. 11. Covalent Bond <br />A bond that forms when atoms share electrons.<br />
  12. 12. Metallic Bond<br />A bond that forms when electrons are shared by metal ions.<br />
  13. 13. Key Concept<br />What is an element?<br />An element is a substance that cannot be broken down into simpler substances by chemical or physical means.<br />
  14. 14. Key Concept<br />What particles make up atoms?<br />An atom is the smallest particle of matter that contains the characteristics of an element.<br />
  15. 15. Key Concept<br />What are isotopes?<br />Atoms with the same number of protons but different numbers of neutrons are isotopes of an element.<br />
  16. 16. Key Concept<br />What are compounds and why do they form?<br />A compound is a substance that consists of two or more elements that are chemically combined in specific proportions.<br />
  17. 17. Key Concept<br />How do chemical bonds differ?<br />When an atom’s outer-most energy level does not contain the maximum number of electrons, the atom is likely to form a chemical bond with one or more other atoms.<br />

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