Which of the following is a correct description of energy transfer within an endothermic reaction?

Endothermic reactions draw heat into the reaction. Heat is transferred from the surroundings into the reaction. The reaction heats up while the surroundings cool down.

Explanation: ice melting in a glass of water would be an example of an endothermic reaction. The ice pulls heat from the water, cooling the water down, but causing the ice to heat up making the ice melt.

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.