Which of the following best describes the energy involved in an exothermic chemical reaction before the reaction? (pick only one answer choice! ) a. the energy was stored in chemical bonds. b. the energy was created during the reaction. c. the energy was available in the environment. d. the energy was destroyed immediately during the reaction. *i'm sure that b. and d. are incorrect since energy can neither be created nor destroyed.*

I believe that the answer is A.

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.

let that person have a turn to speak : )