The atomic number.
If your question is about chemical symbol the answer is molar mass. It is the weight of a single atom.
The Atomic Number
APEX
molar mass it is the weight of a single atom.
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the def for variable is a letter or symbol used to represent a missing number in an algebrac expression
Depending upon which symbol you mean, it usually means that symbol DOUBLED.
the pue
Sign-value numeral systems, such as Roman numerals, repeat certain symbols a certain number of times to show how many should be in a particular decimal place. Abjad numeral systems use letters of the alphabet to represent numerical values.
The radical symbol ( √ ) followed by a line above what's in the radical, designates positive square root.
the number above the symbol is the atomic....... of that element.
variable
b
The atomic number.
There is no symbol above the number 0 on my phone keyboards. So clearly, it is not a standard.
A variablẹ
A variable
variable
Variable: A letter or symbol used to represent a number or quantities that vary
A power or exponent.
it is any letter or mathematical symbol that represent a number or a set of number