What is the term for a horizontal row in the periodic table that contains elements With properties that vary from metallic to nonmetallic?

What is the term for a horizontal row in the periodic table that contains elements With properties that vary from metallic to nonmetallic?

a. group and family

b. group and series

c. period and family

d. period and series

Answer: c. period and family

The rows in the periodic table are called periods while columns within it are known as groups or families.

The groups and elements are also different in their metallic properties starting from the right side where they tend to be nonmetallic on finding elements of the period. This is because when we go from left to right in a period, the number of electrons at outermost orbital increases.

Atoms become less metallic and more nonmetallic character as electrons increase. During an interval of time, all the elements have equal occupied energy levels.

Therefore, a period is defined as a submission of elements that approach horizontally across the periodic table and where their properties fluctuate from metallic to non-metallic. The vertical rows are referred to as groups or families . The term period-family is used to denote an arrangement of elements horizontally where metallic through non-metallic properties are observed.