Which of the following options correctly describe the mass number of an element? Select all that apply. The mass number is given

Question

Which of the following options correctly describe the mass number of an element? Select all that apply.
The mass number is given by the sum of the protons and neutrons in the nucleus.
The mass number is often written as a left superscript next to the atomic symbol.
The mass number of an element is given the symbol A.
The mass number of a particular element never varies.
In a neutral atom, the mass number equals the number of electrons in the atom.

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