Tuesday, January 4, 2011

January 4, 2011

Today in chemistry, Mrs. M asked for us to bring our journals to get them stamped for the homework of the previous night which was page 3. After stamping we went over page 3 and checked all of our answers. Then we moved onto page 6 and learned about isotopes. Isotopes are atoms that have the same number of protons but have a different number of neutrons. Then we started pages 5 and 7 for practice to get familiar with how to identify: the isotope symbol, the name of the isotope, the atomic number, the mass number, number of electrons (in a neutral atom), the number of protons, and the number of neutrons.

  • To find the isotope symbol you have to put the mass number on top of number of protons the element has, then put the element's symbol after that.
After finishing with page 7 we moved onto page 10 and learned about "half-lives." A half-life is the period of time it takes for a substance undergoing decay to decrease by half. We then practiced using half-lives to figure out a problem. Then class ended and Mrs. M assigned us page 9 and page 10 #3 for homework.


- Taso K.

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