题目

Have you heard about “Survival Holidays”? “Survival Holidays” is for children to go into the lonely place for exciting activities. Now about 1,100 companies are allowed to take children into the great outdoors without their parents.The reason why people like “Survival Holidays” is that they think being close to nature is good for children. Many children in big cities spend all time watching TV and playing computer games. “Survival Holidays” gives them an important change.Is “Survival Holidays” a wonderful idea? Maybe it is. Children need more free time to play. They need to19．（1）X、Y形成离子后电子层结构都与氖原子相同，化合物为XY2，X为MgY为F，X与Y间形成离子键．（共价键或离子键）（2）下列各组粒子，属于同种核素的是④（填编号，下同），互为同位素的是③，互为同素异形体的是①，为同一物质的是⑥．①16O2和18O3②质子数相同而中子数不同的两种粒子③${\;}_{1}^{1}$H、D、T  ④${\;}_{15}^{30}$R和（核内15个中子）⑤葡萄糖和果糖    ⑥ 和