Elements in the same __ have similar properties.
A. Group
B. Period
C. Category
D. Family
The Correct Answer and Explanation is:
The correct answer is D. Family.
In chemistry, the periodic table is organized in such a way that elements with similar properties are grouped together. The term “family” refers to the vertical columns of the periodic table, which are also known as groups. Elements within the same family share similar chemical properties due to their similar electron configurations, particularly in their outermost shells.
For instance, the alkali metals (Group 1) include lithium, sodium, potassium, and others. These elements have one electron in their outer shell, which makes them highly reactive and leads to similar behaviors, such as forming ions with a +1 charge. They react vigorously with water and have low melting points compared to many other metals.
Another example is the halogens (Group 17), which include fluorine, chlorine, bromine, and iodine. Halogens have seven electrons in their outer shell, making them highly reactive nonmetals that tend to gain an electron to achieve a stable octet configuration. This characteristic leads to similarities in their chemical reactions, such as forming salts when they react with alkali metals.
While “group” is a synonymous term often used interchangeably with “family,” in the context of the periodic table, “family” emphasizes the similar properties shared among the elements within a specific group. It highlights the notion of these elements behaving similarly in chemical reactions and having comparable physical properties, such as boiling and melting points.
The terms “period” and “category” do not apply in this context. A period refers to the horizontal rows of the periodic table where elements show a gradual change in properties, while “category” is a more general term that does not specifically denote a grouping based on chemical behavior.
In summary, elements in the same family exhibit similar properties, making this the correct choice for the question.