A student attempts to arrange four elements (as shown below) in order from most reactive to least reactive.
19 12 6 2
K Mg C He
39.10 24.31 12.01 4.00
Most reactive ----------------> least reactive
Is the arrangement correct, and why (or why not)?
(1 point)
No. An element's reactivity decreases as atomic mass increases.
Yes. An element's reactivity decreases along with its atomic number.
Yes. An element's reactivity decreases from left to right on the periodic table.
No. An element's reactivity decreases from right to left on the periodic table.