Atomic Structure. Define the atom Structure of the Nuclear Atom Distinguish between atoms. In groups of 7 you will research the following scientistsâ€™ ideas and contributions to the atomic model.
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Define the atom
Structure of the Nuclear Atom
Distinguish between atoms
In groups of 7 you will research the following scientists’ ideas and contributions to the atomic model.
6. Eugen Goldstein, 7. James Chadwick
# of protons
# of electrons
Average atomic mass
Round this for mass numberHow do you find the # of neutrons?
Mass number =
Atomic number =
Number of neutrons=
1.Write the symbol, place the atomic number as the subscript and the mass number as the superscript to the left of the symbol.
Remember!!Atomic # = protons = electronsMass # = Protons + NeutronsNeutrons = Mass # - ProtonsProtons = Mass # - Neutrons
Atoms that have the same number of protons, but different numbers of neutrons, therefore having different mass numbers
Three isotopes of oxygen are oxygen-16, oxygen-17, oxygen-18. Write the symbol for each, including the atomic number and mass number.
Chromium-50 = ____ neutrons
Chromium-52 = ____neutrons
Chromium-53 = ____ neutrons
Calculating the atomic mass
Multiply the mass of each isotope by the natural abundance, expressed as a decimal, and then add the products
Element X has 2 natural isotopes. The isotope with a mass of 10.012 amu (10X) has a relative abundance of 19.91%. The isotope with a mass of 11.009 amu (11X) has a relative abundance of 80.09%. Calculate the atomic mass of this element
For 10X: 10.012 amu x 0.01991= 1.993 amu
For 11X: 11.009 amu x 0.8009 = 8.817 amu
For element X: atomic mass =10.810 amu
* Atomic mass of element X ?
mass = 10.012 amu
rel. abun= 19.91% or 0.1991
mass = 11.009 amu
rel. abun.= 80.09% or 0.8009
1. The element of copper has naturally occurring isotopes with mass number of 63and 65. The relative abundance and atomic masses are 69.2% for mass = 62.93 amu, and 30.8% for mass = 64.93 amu. Calculate the average atomic mass of copper
2. Calculate the atomic mass of bromine. The 2 isotopes of bromine have atomic masses and relative abundance of 78.92 amu (50.69%) and 80.92 amu (49.31%)