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Ch. 3 Sec. 1 Introduction to Atoms
 
central core of atom no charge positive charge negative charge
 
Helium Electrons move within a sphere shaped region around the nucleus.
 
(almost 2,000)
 
 
<ul><li># of protons in atom’s nucleus </li></ul><ul><li>used to identify element </li></ul><ul><li>Atomic mass number </l...
isotope- element with same # of protons & different # of neutrons
 
 
Chadwick model Picture Brief description Model  Present Modern model Bohr model Rutherford model Nagaoka model Thomson mod...
Were you paying attention?
Protons, neutrons and electrons <ul><li>What are the three main particles in an atom? </li></ul>
proton- positive charge neutron- no charge electron- negative charge <ul><li>How do the particles of an atom differ in ele...
Each atom has equal numbers of positively charged protons and negatively charged electrons. <ul><li>Why do atoms have no e...
The number of protons in each atom of that element. <ul><li>What is the atomic number of an element? </li></ul>
Each element has a unique atomic number because all atoms of that element have the same number of protons. <ul><li>How can...
Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons. <ul><li>The atomic number of the isotope nitrogen...
Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons. <ul><li>The atomic number of the isotope nitrogen...
Atoms are too small to be seen. <ul><li>What is the main reason that scientists use models to study atoms? </li></ul>
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7th Grade Ch 3 Sec 1 Introduction To Atoms

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Transcript of "7th Grade Ch 3 Sec 1 Introduction To Atoms"

  1. 1. Ch. 3 Sec. 1 Introduction to Atoms
  2. 3. central core of atom no charge positive charge negative charge
  3. 5. Helium Electrons move within a sphere shaped region around the nucleus.
  4. 7. (almost 2,000)
  5. 10. <ul><li># of protons in atom’s nucleus </li></ul><ul><li>used to identify element </li></ul><ul><li>Atomic mass number </li></ul><ul><li>sum of protons & neutrons </li></ul>
  6. 11. isotope- element with same # of protons & different # of neutrons
  7. 14. Chadwick model Picture Brief description Model Present Modern model Bohr model Rutherford model Nagaoka model Thomson model Atoms all alike Diff. elements-diff. masses Dalton model
  8. 15. Were you paying attention?
  9. 16. Protons, neutrons and electrons <ul><li>What are the three main particles in an atom? </li></ul>
  10. 17. proton- positive charge neutron- no charge electron- negative charge <ul><li>How do the particles of an atom differ in electric charge? </li></ul>
  11. 18. Each atom has equal numbers of positively charged protons and negatively charged electrons. <ul><li>Why do atoms have no electric charge even though most of their particles have charges? </li></ul>
  12. 19. The number of protons in each atom of that element. <ul><li>What is the atomic number of an element? </li></ul>
  13. 20. Each element has a unique atomic number because all atoms of that element have the same number of protons. <ul><li>How can atomic numbers be used to distinguish one element from another? </li></ul>
  14. 21. Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons. <ul><li>The atomic number of the isotope nitrogen-15 is 7. How many protons, neutrons and electrons make up an atom of nitrogen-15? </li></ul>
  15. 22. Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons. <ul><li>The atomic number of the isotope nitrogen-15 is 7. How many protons, neutrons and electrons make up an atom of nitrogen-15? </li></ul>
  16. 23. Atoms are too small to be seen. <ul><li>What is the main reason that scientists use models to study atoms? </li></ul>
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