An Element's Most Stable Ion Forms an Ionic Compound with Chlorine

question 62

Multiple Choice

An element's most stable ion forms an ionic compound with chlorine having the formula XCl₂.If the ion of element X has a mass number of 89 and 36 electrons,what is the identity of the element X,and how many neutrons does it have?

• A) Kr,53 neutrons
• B) Kr,55 neutrons
• C) Se,55 neutrons
• D) Sr,51 neutrons
• E) Rb,52 neutrons

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Definitions:

Sensorimotor Period

The first stage in Piaget's theory of cognitive development, ranging from birth to approximately 2 years of age, where infants learn through sensory experiences and manipulating objects.

World Around Them

The environment and circumstances in which individuals live and interact, encompassing both physical and social aspects.

Secondary Circular Reactions

Repetitive actions in infant development focused on external objects, marking a key phase in the sensorimotor period where the child begins to interact more with their environment.

Primary Circular Reactions

A term from Piaget's theory referring to the first habits and reflexes in infants, where they discover by chance and repeat actions centered on their own body.