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Na is "short" for natrium, an original name given to the element sodium.
The number of protons in the nucleus of its atoms, which is its atomic number, defines each element. However, the nuclei of a given element may have varying numbers of neutrons.
The atomic number in a given element is equivalent to the number of protons in the element.
isotopes of a given element differ in the number of neutrons they have.
Ekasilicon (Mendeleev's name for the element below Silicon, 1869) is named germanium since it was discovered (1886).Eka (from Sanskrit) means 'first' for first element downwards.
The name given to a set of coordinates is "coordinate system".
Because every member of the empty set (no such thing) is a member of any given set. Alternatively, there is no element in the empty set that is missing from the given set.
The side element is called a vent.
file is a set of data and program that has been given a name
Given a set of integers, the LCM is the smallest integer which is a multiple of each of element of the set.
The name uranium is derived from the name of the planet Uranus.
2n - 1
Some were were given symbols from their names in other languages.
The only proper subset of a set comprising one element, is the null set.
I don't think there is any special name for that.
it has not yet been discovered
The only rule for any set is that given any element [number], you should be able to determine whether or not it is a member of the set.