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