Question

The elements in a row of the periodic table
Have properties that change in a pattern
Have the same average atomic mass

Answer 1

The elements in a row of the periodic table, known as a period, have properties that change in a pattern. While elements in the same row do not necessarily have the same average atomic mass, they do exhibit trends in properties such as electronegativity, ionization energy, and atomic radius as you move from left to right across the row. Generally, atomic mass increases from left to right due to the increasing number of protons and neutrons in the nucleus.

In summary, the key point is that elements in a period show a systematic change in their chemical and physical properties across the row.