Question

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page 18 of 25
question 18
generally, ______________ elements are the least reactive.
a halogen
b noble gas
c alkaline earth
d transition metal

Explanation:

Noble gases have a full - outer electron shell, which makes them very stable and less likely to participate in chemical reactions compared to other elements. Halogens are highly reactive non - metals, alkaline earth metals are reactive metals, and transition metals also show various levels of reactivity.

Answer:

B. noble gas