Answer:
metallic bond
because this diagram is electron gas theory which shows metallic bond
There are several types of surfactants, to name two: alkylbenzene sulfonates or detergents; and lauryl sulfate or foaming agents.
Alkylbenzene sulfonates are commonly used in the production of detergent soaps, these help clean the dirt from cloths and other materials, it also produces foam.
Lauryl sulfate or foaming agents are commonly used in the production of dishwashing liquid or handwashing soap.
When calcium joins with calcium its follows the following equation:
2Ca + O2 = 2CaO
hope that helps