36 neutrons. One way we have of differentiating between various nuclides of the same element is by writing the name of the element followed by a hyphen and the mass number of the nuclide. In your case, you would have zinc-66, a nuclide of zinc that has a mass number equal to 66. Now, an atom's mass number, A, tells you the number of protons, which is given by the atomic number, Z, and neutrons ...
It's one common notation for stating that the left-hand side is defined as (in contrast to equal to) the expression on the right-hand side.
In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical Operators Block.
notation - Difference between "≈", "≃", and "≅" - Mathematics Stack ...
A better, but less common, notation is $\varepsilon$ (formatted with $\varepsilon$). You can find answers and comments related to that latter symbol $\varepsilon$ in the linked posts.
notation - Symbol for “such that” (not in set) - Mathematics Stack Exchange
notation - What is the mathematical symbol for range? - Mathematics ...
$\mathbb Q$ is used to represent rational numbers. $\mathbb R$ is used to represent reals. Is there a symbol or convention that represents irrationals. Possibly $\mathbb R - \mathbb Q$?
Notation for definition and equivalence Ask Question Asked 12 years, 8 months ago Modified 3 years, 1 month ago
notation - What does "versus" mean in the context of a graph ...
What is the Correct Math Notation for - "For all $i=1$ to $n$"