Francium has isotopes so how can it's atomic mass be a whole number?
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Why do Francium, Radon, Radium, and Actinium have whole numbers for average atomic mass even though they have isotopes? But then elements like Beryllium, Fluorine, and Sodium are listed as having no isotopes but yet they have a decimal for their average atomic mass?
physical-chemistry
asked 59 mins ago
M Floehr
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Why do Francium, Radon, Radium, and Actinium have whole numbers for average atomic mass even though they have isotopes? But then elements like Beryllium, Fluorine, and Sodium are listed as having no isotopes but yet they have a decimal for their average atomic mass?
physical-chemistry
asked 59 mins ago
M Floehr
161
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M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago
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up vote
3
down vote
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up vote
3
down vote
favorite
Why do Francium, Radon, Radium, and Actinium have whole numbers for average atomic mass even though they have isotopes? But then elements like Beryllium, Fluorine, and Sodium are listed as having no isotopes but yet they have a decimal for their average atomic mass?
physical-chemistry
asked 59 mins ago
M Floehr
161
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Why do Francium, Radon, Radium, and Actinium have whole numbers for average atomic mass even though they have isotopes? But then elements like Beryllium, Fluorine, and Sodium are listed as having no isotopes but yet they have a decimal for their average atomic mass?
physical-chemistry
physical-chemistry
asked 59 mins ago
M Floehr
161
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 59 mins ago
M Floehr
161
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 59 mins ago
M Floehr
161
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 59 mins ago
M Floehr
161
asked 59 mins ago
M Floehr
161
161
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
M Floehr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago
add a comment |Â
1
The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago
1
1
The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago
The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago
add a comment |Â
2 Answers
2
active
oldest
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up vote
2
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For highly radioactive elements that don't occur in large quantities in nature, the mass number listed is the mass number of the most stable isotope. When this is done, the value is often written in brackets. The wikipedia page for the Periodic table has some nice details on the organization of the table and the values included.
answered 51 mins ago
Tyberius
6,27731859
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up vote
2
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For elements with no stable isotope (i.e. Francium, Radium, and Actinium), the atomic mass is chosen to be that of the longest lived isotope.
Sodium has more than one isotope, so that statement is not true. But more generally, the masses for stable elements are reflective of the natural abundance of each isotope in a sample of the element.
answered 49 mins ago
PJ R
3865
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
For highly radioactive elements that don't occur in large quantities in nature, the mass number listed is the mass number of the most stable isotope. When this is done, the value is often written in brackets. The wikipedia page for the Periodic table has some nice details on the organization of the table and the values included.
answered 51 mins ago
Tyberius
6,27731859
add a comment |Â
up vote
2
down vote
For highly radioactive elements that don't occur in large quantities in nature, the mass number listed is the mass number of the most stable isotope. When this is done, the value is often written in brackets. The wikipedia page for the Periodic table has some nice details on the organization of the table and the values included.
answered 51 mins ago
Tyberius
6,27731859
add a comment |Â
up vote
2
down vote
up vote
2
down vote
For highly radioactive elements that don't occur in large quantities in nature, the mass number listed is the mass number of the most stable isotope. When this is done, the value is often written in brackets. The wikipedia page for the Periodic table has some nice details on the organization of the table and the values included.
answered 51 mins ago
Tyberius
6,27731859
For highly radioactive elements that don't occur in large quantities in nature, the mass number listed is the mass number of the most stable isotope. When this is done, the value is often written in brackets. The wikipedia page for the Periodic table has some nice details on the organization of the table and the values included.
answered 51 mins ago
Tyberius
6,27731859
answered 51 mins ago
Tyberius
6,27731859
answered 51 mins ago
Tyberius
6,27731859
answered 51 mins ago
Tyberius
6,27731859
6,27731859
add a comment |Â
add a comment |Â
up vote
2
down vote
For elements with no stable isotope (i.e. Francium, Radium, and Actinium), the atomic mass is chosen to be that of the longest lived isotope.
Sodium has more than one isotope, so that statement is not true. But more generally, the masses for stable elements are reflective of the natural abundance of each isotope in a sample of the element.
answered 49 mins ago
PJ R
3865
add a comment |Â
up vote
2
down vote
For elements with no stable isotope (i.e. Francium, Radium, and Actinium), the atomic mass is chosen to be that of the longest lived isotope.
Sodium has more than one isotope, so that statement is not true. But more generally, the masses for stable elements are reflective of the natural abundance of each isotope in a sample of the element.
answered 49 mins ago
PJ R
3865
add a comment |Â
up vote
2
down vote
up vote
2
down vote
For elements with no stable isotope (i.e. Francium, Radium, and Actinium), the atomic mass is chosen to be that of the longest lived isotope.
Sodium has more than one isotope, so that statement is not true. But more generally, the masses for stable elements are reflective of the natural abundance of each isotope in a sample of the element.
answered 49 mins ago
PJ R
3865
For elements with no stable isotope (i.e. Francium, Radium, and Actinium), the atomic mass is chosen to be that of the longest lived isotope.
Sodium has more than one isotope, so that statement is not true. But more generally, the masses for stable elements are reflective of the natural abundance of each isotope in a sample of the element.
answered 49 mins ago
PJ R
3865
answered 49 mins ago
PJ R
3865
answered 49 mins ago
PJ R
3865
answered 49 mins ago
PJ R
3865
3865
add a comment |Â
add a comment |Â
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M Floehr is a new contributor. Be nice, and check out our Code of Conduct.
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1
The Wikipedia data for Francium, Radon, Radium, and Actinium has mass numbers (protons + neutrons) not atomic masses since all the isotopes of these elements are radioactive.
– MaxW
51 mins ago