What prompted rutherford to do the alpha particle experiment

Ernest Rutherford was interested in knowing the arrangement of electrons in an atom. For this, he conducted a unique experiment of scattering of positive charged Alpha particles by a gold foil.

Infact, alpha particles are nuclei of helium atom, with two units of positive charge and four units of mass. These particles are emitted by radio active elements like Radium and potassium. Fast moving alpha particles have considerable amount of energy and they can penetrate through matter to some extent.

yes, water is wet, just as it makes other things wet, it is wet itself, kinda like ice, when ice is in water, the ice makes water cold, and ice is cold, therefore with that example, water is wet

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.