The natural abundance of 3He is 0.000137%. (a) How many protons, neutrons, and electrons are in an atom of ? He? 3? (b) Based on the sum of the masses of their subatomic particles, which is expected to be more massive, an atom of ? He or an atom of ? H (which is also called tritium)? (c) Based on your answer to part (b), what would need to be the precision of a mass 3 ? +? 3? +? spectrometer that is able to differentiate between peaks that are due to ? He? and ? H? ?
America Before Europeans 8/29/16 These noteswillcover: America before Europeans o The Bering Strait and Migration Patterns o “Indians” Origins Name Controversy o Tribal Societies andConflicts Basic Tribal Structure Larger Groupings Inter-Tribal Conflict o Contact with Europe Vikings Spanish Explorers o The Effects of Contact Columbian Exchange Disease Beringia Theland thatcoveredwhatis notthe BeringStrait AllowedpeopletomigratetoAmerica Over30,000 yearspeoplemigratedfromtheareaof