![]() (in other words we reduced 100% to decimal form 1. We will let 6Li = x and 7 Li = 1-x we use 1 – x instead of 100 – x because the small number is easier to work with. Is the atomic mass of lithium 6 or 7 The average atomic mass of lithium is 6. Since I don’t know what the percentage are, I will have to use variables.ġ00% of Lithium is determined by these two naturally occurring isotopes. The atomic number of Lithium is 3, its mass number is 7. Neutron Number and Mass Number of Lithium Mass numbers of typical isotopes of Lithium are 6 7. Include the atomic number and mass number for each. Determine the percent abundance of each isotope.Īw = + + Ħ.94 = + by Nick Connor Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. One such grouping includes lithium (Li), sodium (Na), and potassium (K): These elements all are shiny, conduct heat and electricity well, and have similar chemical properties. The atomic mass of lithium is 6.94, the naturally occurring isotopes are 6Li = 6.015121 amu, and 7Li = 7.016003 amu. What are the percent abundances of the isotopes? Since the overall atomic weight for copper is not given in the problem, you must look it up in the periodic table to work this solution. If you look in the periodic table you will be able to check that our answer is correct!ģVerify that the atomic mass of magnesium is 24.31, given the followingĪtomic mass= + + ĭetermining the percent abundance of each isotope from atomic mass.Ĭopper exists as two isotopes: 63Cu (62.9298 amu) and 65Cu (64.9278 amu). It has 17 positive charges and 17 negative charges, meaning that it is neutral overall. Every chlorine atom has 17 protons and 17 electrons. ![]() Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. For example, the atomic number of chlorine is 17. Since the lithium has three electrons around the nucleus of an atom. atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard. 10.81amu so, the atomic weight of B = 10.81amu Lithium (Li) has atomic number 3 and mass number 6.941.
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