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Chemistry Journal : November 25

Chemistry Journal : November 25. Use a periodic table to help answer the questions below. How does the electron configuration for bromine end? 2. How many energy levels are there in a bromine atom? What name is given to the group that contains bromine?.

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Chemistry Journal : November 25

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  1. Chemistry Journal: November 25 Use a periodic table to help answer the questions below. • How does the electron configuration for bromine end? 2. How many energy levels are there in a bromine atom? • What name is given to the group that contains bromine?

  2. Electron Configurations and the Periodic Table • When writing electron configurations using the periodic table, • the number in front of the s is the period number • the number in front of the p is the period number • the number in front of the d is one less than the period number • the number in front of the f is two less than the period number

  3. Sample Problems Using the period table, write the electron configuration for these atoms: • phosphorus (P) (b) tin (Sn)

  4. Noble Gas Electron Configurations • Sometimes we are only interested with electrons in the highest energy level. • In noble gasconfigurations, we start with the noblegas before the element and build from there. • Bromine (Br) [Ar] 4s2 3 d10 4p5

  5. Sample Problems Write noble gas electron configurations for these atoms: • aluminum (Al) • barium (Ba)

  6. Using Shorthand Configurations • Give the identity, the block, period, and group for the atom that has the following shorthand configuration [Ar] 4s2 3d10 4p3 Identity: _________ Period:_________ Block: ___________ Group:_________

  7. Wrapping It Up • Respond to the following… • What is most important thing you learned today? • What question you would still like answered? • What is one way what you have learned today connects with what you knew before?

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