2nde Periodic Trends Homework Name: ……………………………………………….. 1. On graph paper, plot a graph of atomic radius against atomic number. Pay attention to title, scale, axes etc. (5) 2. Explain the change in atomic radius observed as you move down group 17 ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………(2) 3. In your own words, suggest why group 17 elements prefer to gain rather than lose electrons. ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………(2) 4. In your own words, suggest why it would be much easier for fluorine to gain an extra electron than for iodine to gain an extra electron. ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………(2) 5. It is said that non-metals become more metallic (e.g. conduct electricity better) as you move down their groups. From your knowledge of metallic bonding (see attached ppt) try to explain why this may be true? ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………(2) 6. Predict and explain which would give the most violent reaction: a) Sodium and fluorine b) Potassium with iodine c) Rubidium with fluorine d) Lithium with iodine ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… 1 ………………………………………………………………………………………………………………………………………………………(2) 7. From your graph observe how atomic radius changes as you cross a PERIOD. State and find out the reason for this trend. Include two reliable references (including dates if web pages) ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………………………………………… 2 ………………………………………………………………………………………………………………………………………………………(3)
