Symbols <ιμγωιδτη=∀115∀ηειγητ=∀32∀σρχ=∀2−χηαπτερ_φιλεσ/ιμαγε014.πνγ∀> can be written, whereas symbols <ιμγωιδτη=∀117∀ηειγητ=∀32∀σρχ=∀2−χηαπτερ_φιλεσ/ιμαγε015.πνγ∀> are not acceptable. Answer briefly.


The general convention or method of representing an element along with its atomic mass [A] and atomic number [Z] followed globally is AZX. Atomic number of an element is fixed. However, mass number is not fixed as it depends upon the isotope taken. Hence it is essential to indicate mass number.


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