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What is the scientific notation for distance from Earth to Alpha Centauri? The distance from Earth to the nearest star outside the solar system is approximately 25,700,000,000,000 miles.
Alpha Centauri is the nearest star as far as present knowledge allows. So the distance to Alpha Centauri is 25700 000 000 000 Putting this value into scientific notation involves...
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Which elements are most common on earth? Are these elements found uniformly on other planets?
The elements in order of abundance on Earth by mass are: Iron 32.1% Oxygen 30.1% Silicon 15.1% Magnesium 13.9% All of the other elements together total the remaining amount. The...
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Does nuclear fussion occur naturally?
Atoms and nuclei experience strong electrostatic repulsion forces (between electrons and protons respectively) which increase exponentially as they get closer to one another (the force obeys the ubiquitous "inverse square...
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Approximately how many elements are in the universe?
And , the which should be in front of you now, tells you their name, and atomic masses, and conveniently divides them up into Groups and families, so their chemistry...
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Approximately how many elements are known today?
For a printable periodic table with all 118 elements can be found at .
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Group 18 rarely combines with other elements. They are the "loners" or noble gases. Why do these elements not need to bond with other elements?
The main reason the noble gases do not need to bond with other is that their outermost subshells are filled. These are known as . Take helium for example. It...
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Naturally occurring uranium contains 0.72 percent of the isotope uranium-235. What is the mass of uranium-235 in 2,000 kg of naturally-occurring uranium?
We can use our percentage to find it as: $0.72/100*2,000=14.4kg$ Percentage represents a fraction of $100$ so we can say that: if in $100$ we have $0.72$ then in $2,000$...
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An element has two naturally occurring isompes widx atomic masses of 10.01 amu and 11.01 amu. The relative abundances of these elements are 19.8% and 80.2%, respectively. What is the average atomic mass of the element?
Now I hope you have been exposed to the concept of weighted average; If not here is a video Now lets get our data; Lets call our element...
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The atomic mass of element A is 63.6 atomic mass units. The only naturally occurring isotopes of element A are A-63 and A-65. What is the percent abundance in a naturally occurring sample of element A closest to?
The average isotopic mass is the weighted average of the mass of the individual . Because the quoted average, $63.6$ $"amu"$, is closer to $""^63A$ than $""^65A$, the $""^63A$...
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The isotope 121sb makes up 57.21% of naturally occurring antimony. The only other naturally occurring isotope is 123sb. Deduce the relative atomic mass of antimony according to this data. How do I do that?
In each 100 $mol$ of Sb you have: $57.21$ mol of $ _ ^(121)Sb$ and $100-57.21=42.79 mol$ of $ _ ^(123)Sb$ Assuming the mass of the isotopes is integer (they...
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