Scientists described light as a wave because the results of many experiments with light demonstrated that light behaves as a wave. light is now described as having properties of both a wave and a particle. what is the most likely reason why this change was made? enough scientists voted to accept the change. data collected from many experiments could not be explained using waves. a well-known scientist published a paper that described light as a particle. a single experiment's results demonstrated both wave and particle properties.

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.

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increased stability in the completion of fluorine's outer shell.