milre abuindans? tesclais yosir anewer. 11. Explain how a uass mumber is different than we atwenic masa. 12. Deserihe the difference between the following puirs of atoms at the sabatemic particle level: a. 3580Br&3579Br b. 35Br \&. 3579Br 13. Give both the name and the symbol for the elements thai fits the followisg deseriptions: a. The halogen in period 4 . b. The alknline cirth metal in period 2 c. The noble gas in period 5 d. The transition metal is period 5 : group 18 M. Rasen