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The name of such a number is a decimal number. The digits after the decimal point represent tenths, hundredths, thousandths, and so on.
-12 is the decimal equivalent of -12. -12 is also an integer, rational number, and a real number to name a few more.
That depends on what kind of number name you are given: an improper fraction? A decimal? A percentage? ...
Other than a negative number, there is no special name.
One and three hundred eight thousandths.
The number found below the name and symbol of an element on most periodic tables. Usually has a decimal, but doesn't have to.
group name is noble gases. group number is 18.
In the case of each chemical element the name is found.
A terminating decimal.
It is a terminating decimal.
Einsteinium has a proton number of 99, and can be found in the actinide group on the periodic table.
The name of the element with the atomic number 54 is Xenon (Xe).
The name of the element that has atomic number 3 is Lithium (Li).
Ytterbium (Yb) is the name of the element with the atomic number 70.
Gallium.
The name of such a number is a decimal number. The digits after the decimal point represent tenths, hundredths, thousandths, and so on.
Allthese can NOT be calculated being physical properties of each specific element. They can be found in 'periodic tables' eg. by typing in the element name in a wikipedia-search