Which of these observations rutherford determine that atoms have tiny, dense, positively charged nuclei? which of these observations rutherford determine that atoms have tiny, dense, positively charged nuclei? most of the alpha particles in his experiment passed directly through the gold foil. some materials naturally give off alpha particles. a few of the alpha particles in his experiment were deflected from the gold foil at large angles. none of the alpha particles in his experiment could travel through lead.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.