16. When combining with other elements, alkaline earth metals tend to form A. anions with 2 charges B. anions with 1 charge C. atoms with no charge D. cations with 1 charge E. cations with 2 charges
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
First of all you need to know the general electronic configuration of alkaline earth metals that is ns2 which means it has two electrons in its outermost shell. When the atom get energy coming near to another atom by the mean of collision or any other force it can easily remove its outermost two electrons to form a cation with two +ve charge on it. and thus it get attached with other atoms to form a new molecule.
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