A B 21085At Fe Mo 5827Co 3216S Pb4+ Symbol

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Presentation transcript:

A B 21085At-1 5526Fe3+ 9642Mo 5827Co 3216S2- 20782Pb4+ Symbol Symbol Atomic Mass Atomic number Protons Neutrons Electrons A 21085At-1 5526Fe3+ 9642Mo B 5827Co 3216S2- 20782Pb4+

Naturally occurring magnesium consists of three stable isotopes: 24 Mg, 23.985 amu (78.99%); 25 Mg, 24.986 amu (10.00%); and 26 Mg, 25.983 amu (11.01%). Calculate the average atomic mass of magnesium. B. 68.9257 amu is the mass of 60.4% of the atoms of an element with only two naturally occurring isotopes. The atomic mass of the other isotope is 70.9249 amu. Determine the average atomic mass of the element.

A B Symbol Atomic Mass Atomic number Protons Neutrons Electrons Symbol Atomic Mass Atomic number Protons Neutrons Electrons A 21085At-1 210 85 125 86 5526Fe3+ 55 26 29 23 9642Mo 96 42 54 B 5827Co 58 27 31 3216S2- 32 16 18 20782Pb4+ 207 82 78

A. 23.985 amu (0.7899) = 18.95 24.986 amu (0.1000) = 2.499 25.983 amu (0.1101) = 2.861 Mg 24.31 amu B. 68.9257 amu (0.604) = 41.6 70.9249 amu (0.396) = 28.1 Ga 69.7 amu