Question

which pair of words correctly completes the statement?
alkali metals are highly ____ since they ____ easily to form ions.
○ reactive; gain 1 electron
○ nonreactive; lose 1 electron
○ nonreactive; lose 2 electrons
○ reactive, lose 1 electron

Explanation:

Alkali metals (Group 1 elements) have 1 valence electron. They are highly reactive as they easily lose this 1 electron to achieve a stable electron configuration (similar to noble gases). Losing electrons is a characteristic of metals in chemical reactions.

Answer:

reactive, lose 1 electron