Atomic Calculations and Mass Spectrometry
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Atomic Calculations and Mass Spectrometry. Quantum Orbital Video. Atomic Mass – Atomic Number = # Neutrons (p + n) - (p) = (n). 110. Complete the following chart: protonselectronsneutrons H Zr Ca 2+ P 3- Al 3+ Cl -. 404051. 201820.

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Atomic Calculations and Mass Spectrometry

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Atomic calculations and mass spectrometry

Atomic Calculations and Mass Spectrometry

Quantum Orbital Video


Atomic calculations and mass spectrometry

Atomic Mass – Atomic Number = # Neutrons

(p + n) - (p) = (n)


Atomic calculations and mass spectrometry

110

Complete the following chart:

protonselectronsneutrons

H

Zr

Ca2+

P3-

Al3+

Cl-

404051

201820

151816

131014

171819


Atomic calculations and mass spectrometry

Isotopes- same atomic number but different mass

For example, there are 3 types of hydrogen atoms.

1H 2H 3H

Not all atoms of the same element are identical.


Atomic calculations and mass spectrometry

Mass Spectrometers

Are used to determine the abundance and mass of the isotopes of elements


Atomic calculations and mass spectrometry

Mass Spectrometers

A device known as a mass spectrometercan be used to determine the relative abundanceand the mass of the isotopes of elements. 

In the graph the isotopes of a sample of the element zirconium can be seen in their relative abundances.


Atomic calculations and mass spectrometry

The data can be summarized as follows:

IsotopeMass`Abundance

90Zr90.00 amu              51.5 %

91Zr91.00 amu               11.2 %

92Zr92.00 amu               17.1 %

94Zr94.00 amu               17.4 %

96Zr96.00 amu              2.80 %

atomic mass of isotope 100 %


Atomic calculations and mass spectrometry

Calculate the weighted average mass of zirconium using the data above.

Change each percent to a decimal by dividing by 100.

Multiply by the mass.

Add it all together.

0.515(90.00)

+ 0.112(91.00)

+ 0.171(92.00)

+ 0.174(94.00)

+ 0.0280(96.00)

=91.3 amu

3 sig figs!

Look up the mass on the periodic chart.

The unit amu describes how many times heavier than the mass of H

=91.2 amu

They are the same with uncertainty


Atomic calculations and mass spectrometry

Calculate the average atomic mass for Germanium

36.54 %

73.92115 amu

27.43 %

71.92174 amu

20.52 %

69.92428 amu

7.76 %

75.9214 amu

7.76 %

72.9234 amu

(0.2052)(69.92428) + (0.2743)(71.92174) + (0.0776)(72.9234) + (0.3654)(73.92115) + (0.0776)(75.9214) =

=72.6 amu

Periodic Table=72.6 amu


Atomic calculations and mass spectrometry

Quantum orbitals


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