Now you try! Helium – 4 Oxygen – 16 Magnesium – 26 Isotope

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4.3: HOW ATOMS DIFFER ATOMIC NUMBER

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Presentation transcript:

Now you try! Helium – 4 Oxygen – 16 Magnesium – 26 Isotope Hyphen Notation Atomic Number Mass Number Protons Electrons Neutrons Nuclear Symbol Helium-4 Oxygen-16 Magnesium-26 Helium – 4 Oxygen – 16 Magnesium – 26

Bohr Model of the Atom

Carbon-12 Carbon-13 Carbon-14 Examples Carbon-12 Carbon-13 Carbon-14

Now you try! Helium – 4 Oxygen – 16 Magnesium – 26

PRACTICE

B Average Atomic Mass A weighted average of an element’s isotopes. Places an emphasis on isotopes with a larger abundance. 5 B 10.812 Boron

Calculating Average Atomic Mass A.A.M.=(Mass 1*Percent1)+(Mass 2*Percent2)+ …

Calculating Average Atomic Mass A.A.M.=(Mass 1*Percent1)+(Mass 2*Percent2)+ … Ex: There are two natural occurring isotopes of the element chlorine. Chlorine-35 is 75.8% abundant, while chlorine-37 is 24.2% abundant. Calculate their average atomic mass.

Calculating Average Atomic Mass A.A.M.=(Mass 1*Percent1)+(Mass 2*Percent2)+ … Ex: Calculate the average atomic mass of zirconium given the following information: Isotope Abundance Zirconium-90 51.5% Zirconium-91 11.2% Zirconium-92 17.2% Zirconium-94 17.4% Zirconium-96 2.8%

Calculating Average Atomic Mass A.A.M.=(Mass 1*Percent1)+(Mass 2*Percent2)+ … Ex: Use the data from the mass spectrum graph to determine the element’s average atomic mass. Then, identify the element.

PRACTICE