题目

锗（Ge）是典型的半导体元素，在电子、材料等领域应用广泛。回答下列问题： （1）基态Ge原子的核外电子排布式为Ar]____________，有__________个未成对电子。 （2）Ge与C是同族元素，C原子之间可以形成双键、叁键，但Ge原子之间难以形成双键或叁键。从原子结构角度分析，原因是________________。 （3）比较下列锗卤化物的熔点和沸点，分析其变化规律及原因_____________________。 GeCl4GeBr4GeI4 熔点/℃−49.526146 沸点/℃83.1186约400 （4）光催化还原CO2制备CH4反应31、IMPROVE ON SLFEP Good health needs good sleep．Going to bed before you’re tired．Not eating or reading in bed．You must go to bed at the same time before mid-night and get up at the same time．Your body likes routine（常规） for a good night’s sleep． STAY FREE OF FLU Studies show that a cold or H1N1 Flu virus（感冒病毒）can live on our hands for long．So wash all parts of your hands often with soap and water．For more ways to prevent the spread of flu，please call Health Line at 800-848-1313． ORAL HEALTH Brush your teeth twice daily and visit the dentist at least once a year．The mouth is a mirror of disease．The oral examination is not only for the health of teeth，but the whole body．For more of it，please visit www．mydr．com．au． FIT FOR LIFE Studies have shown that many diseases have something to do with less or no physical activity．In order to keep healthy，you should try to take physical activity for 30 minutes a day，5 days or more a week． For more information，please call Health Line at 800-438-2000． 1．What telephone number can we call when we want to learn more about the flu? 2．According to the passage，which suggestion is the most necessary for us to keep healthy? 3．How often should we go to see a dentist?