Question

quiz: period table & trends
possible points: 10
elements in group 17 have ________ valence electrons and will tend to ________ electrons to become more stable like the noble gases
7, gain
7, lose
17, gain
17, lose

Explanation:

Elements in group 17 are halogens. They have 7 valence electrons. Noble - gases have a full outer - electron shell. To achieve a full outer - electron shell like noble gases, halogens gain 1 electron.

Answer:

A. 7, gain