Going down the group:</li></ul>PropertyTrendReasonReactivity (reducing power)IncreasingLose electrons more easilyMelting/boiling pointDecreasing Strength of metallic bonds decrease with atomic sizeDensityIncreasing Mass increases more than volume<br />Group VII elements (Halogens)<br /><ul><li>Exist as diatomic molecules
Going down the group:</li></ul>PropertyTrendReasonReactivity (oxidizing power)DecreasingGain electrons less easilyMelting/boiling pointIncreasing Strength of van der Waals bonds increase with atomic size<br />Group 0 elements (Noble gases)<br /><ul><li>Exist as monatomic molecules
Highly unreactive (because of their stable octet configurations)
Low m.p. / b.p. that increase down the group</li></ul>Workout Questions<br /><ul><li>Element X is in Group VII and Period 5 of the periodic table. Which of the following is true?