Atom 2

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Atom 2

  1. 1. Introduction to Atoms<br />The Fundamental particles of Atoms<br />
  2. 2. Match the word in the left to right<br />positive electrical charge particle<br />Atomic number<br />1<br />No charge particle <br />2<br />Isotope<br />negative electrical charge particle<br />3<br />neutron<br />proton<br /> number of protons +neutron <br />4<br />Atomic mass<br /> number of protons in the nucleus<br />5<br />Atoms of the same element but different mass number<br />electron<br />6<br />
  3. 3. atom<br />An _____is the smallest particle of an element that has the chemical properties of the element.<br />Copper atoms on silica surface.<br />Distance across = 1.8 nanometer (1.8 x 10-9 m)<br />
  4. 4. The Atom<br />Did you know an atom consists of a …..<br />nucleus<br />electrons<br />Electron cloud<br />Nucleus<br />
  5. 5. ATOM COMPOSITION<br />The atom is mostly empty space<br /><ul><li>There are protonsand neutrons in the nucleus.
  6. 6. electronsin space around the nucleus.</li></ul>the number of electrons is equal to the number of protons.<br />
  7. 7. ATOMIC COMPOSITION<br />Protons (p+)<br /><ul><li> + ve electrical charge
  8. 8. mass = 1.672623 x 10-24 g
  9. 9. relative mass = 1.007 atomic mass units (amu) but we can round to 1</li></ul>Electrons (e-)<br /><ul><li>−veelectrical charge
  10. 10. relative mass = 0.0005 amubut we can round to 0</li></li></ul><li>Neutrons (no)<br /><ul><li>no electrical charge
  11. 11. mass = 1.009 amubut we can round to 1</li></li></ul><li>Atomic Number, Z<br />All atoms of the same element have the same number of protons in the nucleus, Z<br />
  12. 12. Mass Number, A<br />C atom with 6 protons and 6 neutrons is 12 atomic mass units<br />B atom with 5 protons and 5 neutrons is 10 atomic mass units<br />What is mass number?<br />Mass Number(A)= # protons + # neutrons<br />
  13. 13. Atomic number<br />Atomic symbol<br />Atomic Mass(AVERAGE)<br />Nuclear symbol<br />A<br />X<br />Z<br />(or Mass number)<br />
  14. 14. Atomic number<br />Atomic symbol<br />Nuclear symbol<br />C atom with 6 protons and 6 neutrons. Write the nuclear symbol of C atom ……<br />Mass number<br />
  15. 15. 11B<br />10B<br />Isotopes<br />Atoms of the same element (same Z) but different mass number (A).<br />Boron-10 (10B) has 5 p and 5 n <br />Boron-11 (11B) has 5 p and 6 n<br />
  16. 16. Learning Check – Counting<br /> Naturally occurring carbon consists of three isotopes, 12C, 13C, and 14C. State the number of protons, neutrons, and electrons in each of these carbon atoms. <br />12C 13C 14C<br />6 6 6 <br />#p+ _______ _______ _______ <br />#no _______ _______ _______ <br />#e- _______ _______ _______<br />6<br />6<br />6<br />6<br />7<br />8<br />6<br />6<br />6<br />
  17. 17. Answers<br />12C 13C 14C<br />6 6 6<br />#p+666<br />#no678<br />#e- 6 66<br />
  18. 18. Isotopes?<br />Which of the following represent isotopes of the same element? Which element?<br /> a). b). c). d).<br />234 X234 X235 X238 X<br /> 92939292<br />
  19. 19. Learning Check<br />An atom has 14 protons and 20 neutrons.<br /> A. Its atomic number is….<br />1) 14 2) 16 3) 34<br /> B. Its mass number is….<br />1) 14 2) 16 3) 34<br />C. Another isotope of this element is…<br />1) 34X 2) 34X 3) 36X<br />16 14 14<br />
  20. 20. Yes, U R the ultrastudent.<br />Thank you<br />

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