Isotopes - What are they? • Find the number of protons, electrons, and neutrons for Nitrogen… • What if one of these atoms had an extra neutron. Would it still be nitrogen? Why or why not? • Why does the atomic mass have decimals? – Why isn’t the number on the periodic table a whole number?
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Isotopes - What are they?
• Find the number of protons, electrons, and neutrons for Nitrogen…
• What if one of these atoms had an extra neutron. Would it still be nitrogen? Why or why not?
• Why does the atomic mass have decimals? – Why isn’t the number on the periodic table a whole number?
Isotopes • While the number of protons for a given element
never changes, the number of neutrons can change.
• An atom of the same element with a different number of neutrons is an ISOTOPE!
• If the number of neutrons changes, so does the mass. Different isotopes will have different mass numbers for the same element.
Isotopes What element do these isotopes represent?
What about these two isotopes?
Calculating the average atomic mass
• Element “X” • Natural abundance
of isotope X • 10% = 4 amu • 30 % = 5 amu • 60 % = 6 amu
• 0.10 x 4 = 0.4 amu • 0.30 x 5 = 1.5 amu • 0.60 x 6 = 3.6 amu • 0.4 + 1.5 + 3.6 =