CHEM 001A Lecture Notes - Lecture 2: Alkali Metal, Natural Abundance, Deuterium
Document Summary
Neutrons are needed to stabilize the proton-filled nucleus. Atomic mass : weighted average based on natural abundance. Groups: vertical columns on the periodic table. (left side and bottom of the table): shiny solids, conduct heat and electricity, malleable and ductile. nonconductors. (between metals and nonmetals): shiny solids (like metals), brittle (like nonmetals), semiconductors. Ions : charged particles formed by transfer of electrons between atoms. Isotopes : atoms of the same element that differ in their neutron number. 0. 0115% t 1/2 =12. 3 y amu and then summing these products. percentage, relative to all the isotopes for that element in a natural sample. Average atomic mass : weighted average of masses of all isotopes of an element. Calculated by multiplying the natural abundance of each isotope by its mass in. 9. 2465 (19. 9924 amu x 0. 904838) + (20. 9940 amu x 0. 002696) + (21. 9914 amu x.
