True. Elements in the same period of the periodic table exhibit some similarities in their chemical properties, although these similarities are not as pronounced as those found among elements in the same group.
To explain further, elements in the same period have the same number of electron shells. For example, all elements in Period 2 have two electron shells. While they are arranged in a way that reflects increasing atomic number, the chemical properties tend to vary more significantly from one element to the next within the period.
However, there are trends that can be observed across a period, such as increasing electronegativity and ionization energy as one moves from left to right. These trends affect how elements react and bond with others, leading to some similarities in behavior among adjacent elements, but it’s important to remember that the strongest similarities in chemical properties are typically found within groups (columns) rather than periods (rows).