Question

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

Explanation:

Non - metals gain electrons to form negative ions. As we move from left to right across a period in the periodic table (excluding noble gases), the atomic size decreases and the effective nuclear charge increases. This makes it easier for non - metals to gain electrons, thus increasing their reactivity.

Answer:

C. increases from left to right across the periodic table