An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results?

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.

An ion with mass number 37 possesses one unit of negative charge. If the ion contains 11.1% more neutrons than the electrons, find the symbol of the ion.

An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons. Assign the symbol to this ion.