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Unformatted text preview: sec)= ……. Isotopes: Different number neutrons Average mass= ATOMIC WEIGHT Question 1: Lithium has two stable isotopes with masses of 6.01512 u and 7.01600 u. what is the percent abundance of each isotope respectively. Percent abundance=(%*amu)+(%*amu)=avg amu (A)(6.01512amu)+(B)(7.01600)= 6.941 A+B=100% ,A=1-B NOMENCLATURE: Ionic compound- METAL+NONMETAL (held together by electrostatic forces, they are constant repeating units) Molecular compound(Covalent)- NONMETAL+NONMETAL Cation:+ Anion:-LOOK AT CH 2 TABLES (pg 55 Multi-valent are transition metals, the anion will tell you the charge. *remember that it can be reduced……EX: CuS (Cu is 2+, S is 2-) GO OVER ACIDS...
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- Fall '07
- Atom, Chemical element, Electric charge