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nucleus of atom

nucleus of atom. +. +. P rotons. N eutral. O S I T I V E. O C H A R G E. -. N G A T I V E. E lectrons. +. The Atom - Charge. Charge can be Neutral, Positive or Negative. Charge is equal to 0. Charge is equal to +1. Charge is equal to -1. What do you notice

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nucleus of atom

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  1. nucleus of atom +

  2. + Protons Neutral O S I T I V E O C H A R G E - N G A T I V E Electrons +

  3. The Atom - Charge Charge can be Neutral, Positive or Negative

  4. Charge is equal to 0

  5. Charge is equal to +1

  6. Charge is equal to -1

  7. What do you notice about the periodic table?

  8. The whole numbers (above the element symbol) increase across the rows. 4 6 3 7 8 9 10 5

  9. The whole numbers are the Atomic Numbers.

  10. Carbon has an atomic number of 6. Carbon has 6 protons.

  11. The atomic number (number of protons) determines the identity of the element. So, if you change the number of protons, you change the element. 6 7 Carbon Nitrogen C N 5 Boron 12.011 14.007 B 10.811

  12. What else do you notice about the periodic table?

  13. There are decimal numbers below the element symbol. 1.0002 6.941 12.011 14.007 15.999 18.998 20.180 10.811

  14. The decimal numbers are the Atomic Masses.

  15. + Mass of an atom with one Proton, one Neutron and one Electron. Mass of an atom with one Proton and one Neutron. 0 amu 2.0164186 amu 2.01587 amu

  16. Electrons are too small to change the mass of the atom. Protons and Neutrons determine the Atomic Mass.

  17. + + + + + + + + + + + + 6 neutrons 7 neutrons • Isotopes = atoms of the same element that have different numbers of neutrons Carbon-12 Carbon-13

  18. 12 amu 13 amu Mass of Carbon-12 Isotope is 12 amu Mass of Carbon-13 Isotope is 13 amu

  19. Carbon has an Atomic Mass of 12.011. 12.011 rounds to 12. So, the Mass Number of carbon is 12 amu. Since the mass of each proton and each neutron is 1 amu and the atomic mass of Carbon is 12 amu, there are 12 protons and neutrons in a Carbon atom.

  20. Atomic Number Atomic Mass

  21. Atomic Number • For example: Carbon has 6 protons. • For example: Carbon has 6 electrons.

  22. Atomic Mass • For example: • Carbon has a Mass Number of 12 • and an Atomic Number of 6. • 12 – 6 = 6 • So, Carbon has 6 neutrons.

  23. Do you notice anything else about the periodic table?

  24. There are roman numerals above each column. VIIIA IA IIA IIIA IVA VA VIA VIIA

  25. The roman numerals are the Group Numbers.

  26. Group IIA elements = 2 valence electrons

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