Question

The periodic table is arranged according to several trends. Which of the following is true as you move from left to right along the periodic table:
A the element's atomic mass decreases and the atomic number increases
B the element's productivity increases
C the element's reactivity decreases as it's stability increases
D the atomic number increases as the reactivity increases****
Correct.

http://edtech2.boisestate.edu/lindabennett1/502/periodic%20table%20e%20config/PTable_trends%20around%20table.html

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