What trend does the reactivity of most nonmetals show in a periodic table, excluding the noble gases?

random changes without any trends on the periodic table
changes according to trends on the periodic table
increases from left to right across the periodic table
decreases from left to right across the periodic table

1 answer

The reactivity of most nonmetals shows a trend that generally increases from left to right across the periodic table, excluding the noble gases. This is primarily due to the increasing electronegativity and the effective nuclear charge as you move across a period, making nonmetals more eager to gain electrons and react, especially in forming compounds. Exceptions do exist, but this is a general trend observed for many nonmetals.