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Well including uranium and a few others that are commonly man-made but are actually natural there are about 92. After and including Americium they are man-made and named for places or people, for example 99 is Einsteinium.
What else can I help you with?
How many electrons does the heaviest naturally occurring element have?
Uranium, number 92 is the last of the naturally occurring elements and, of course, it has 92 electrons.
What element is the lightest actinide that occurs naturally on earth?
The lightest naturally occurring actinide on Earth is thorium, which has the atomic number 90. It is a naturally occurring radioactive element found in small amounts in soil and rocks.
Is thalium man made?
Thallium is a naturally occurring element in the Earth's crust. It is not a man-made element.
How do you calculate the average mass of a naturally occurring element?
By multiplying the mass number of each naturally occurring isotope of the element by the fractional abundance of the same isotope, then adding all the resulting products.
Are the mass number is an average of the masses of all naturally occurring isotopes of an element?
Yes they do.
What is the average of all the naturally occurring isotopes of a particular element?
The average of all the naturally occurring isotopes of a particular element are an element's atomic Mass.
What is the weighted-average mass of all the known isotopes for an element?
The known weighted-averagemass of all the naturally occurring* isotopes for an element is the atomic mass of the element.____________________*This is not the same as "all the known isotopes", becausemost elements have known isotopes that are not naturally occurring.
What is the weighted average of the masses of all naturally occurring isotopes of an element?
The atomic weight of the element (syn.: mass number).
What is the number determined by the average mass of naturally occurring atoms of a given element?
I believe it is a mole
Is platinum made by nature?
Yes. Platinum is a naturally occurring element, with atomic number 78.
Is uranium a element?
Yes, uranium is an element. It is a naturally occurring radioactive metal with the symbol U and atomic number 92.
What is the naturally occurring actinide that is used in nuclear reactors?
We look to the naturally occurring element uranium as a nuclear fuel.
