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Answer :
To determine which isotope of gold is more abundant based on the information provided, we need to compare the given isotopes with the atomic mass of gold found on the periodic table.
1. Understand Isotopes: An isotope is a variant of a particular chemical element, which means it has the same number of protons but a different number of neutrons. This difference in the number of neutrons results in different mass numbers.
2. Gold Isotopes: The two isotopes in question are Au-197 and Au-195. Here:
- Au-197 has a mass number of 197 (79 protons and 118 neutrons).
- Au-195 has a mass number of 195 (79 protons and 116 neutrons).
3. Periodic Table Mass: The periodic table provides the average atomic mass of an element, which represents the average mass of all the isotopes of that element, weighted by their natural abundance. For gold, the atomic mass is approximately 196.97.
4. Compare Isotopes to Atomic Mass:
- Au-197's mass number is 197, which is very close to the atomic mass of 196.97.
- Au-195's mass number is 195, which is further from the atomic mass of 196.97.
5. Determine the More Abundant Isotope: Generally, the isotope with a mass number closer to the atomic mass is more abundant because the atomic mass on the periodic table is a weighted average of all isotopes abundances. Since 197 is closer to 196.97 than 195 is, this implies that Au-197 is more abundant.
Therefore, based on the mass on the periodic table, Au-197 should be the more abundant isotope of gold.
1. Understand Isotopes: An isotope is a variant of a particular chemical element, which means it has the same number of protons but a different number of neutrons. This difference in the number of neutrons results in different mass numbers.
2. Gold Isotopes: The two isotopes in question are Au-197 and Au-195. Here:
- Au-197 has a mass number of 197 (79 protons and 118 neutrons).
- Au-195 has a mass number of 195 (79 protons and 116 neutrons).
3. Periodic Table Mass: The periodic table provides the average atomic mass of an element, which represents the average mass of all the isotopes of that element, weighted by their natural abundance. For gold, the atomic mass is approximately 196.97.
4. Compare Isotopes to Atomic Mass:
- Au-197's mass number is 197, which is very close to the atomic mass of 196.97.
- Au-195's mass number is 195, which is further from the atomic mass of 196.97.
5. Determine the More Abundant Isotope: Generally, the isotope with a mass number closer to the atomic mass is more abundant because the atomic mass on the periodic table is a weighted average of all isotopes abundances. Since 197 is closer to 196.97 than 195 is, this implies that Au-197 is more abundant.
Therefore, based on the mass on the periodic table, Au-197 should be the more abundant isotope of gold.
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