A:SiO2不溶于水,而Na2O2溶于水得到NaOH,则SiO2不是酸性氧化物,Na2O2为碱性氧化物
B:NaHSO4溶液、Na2CO3溶液分别呈酸性、碱性,则NaHSO4属于酸,Na2CO3属于碱
C:HCl、NH3的水溶液都能导电,则HCl、NH3均属于电解质
D:用一束光照射稀豆浆时产生丁达尔效应,则稀豆浆属于胶体
元素
T
X
Y
Z
性质结构信息
原子核外s电子总数等于p电子总数;人体内含量最多的元素,且其单质是常见的助燃剂
单质为双原子分子,分子中含有3对共用电子对,常温下单质性质稳定,但其原子较活泼
第3周期元素的简单离子中半径最小
第4周期元素,M电子层为全充满状态,最外层只有一个电子的原子
____个
The clock struck(敲)eight,but I was still on the bed.I could hear it was blowing strongly.“It must be windy outside,” I thought. I came to the small town a week ago. I sold some clothes to a ten and friends.So I tried to meet the manager and ask him to pay for them.I was out of luck(运气不好).He went to London and I had to wait for him here.There was no theatre here but a cinema.The films were all too old.I preferred staying in the small hotel to sitting in the cold cinema. Half an hour later,I felt hungry.I had to get up.It was white everywhere and some children were skiing down the hill.On my way to the small restaurant,I saw a boy fall on to a rock (岩石).I ran to him quickly and carried him to a hospital.Soon his parents came here.Now I knew the boy was just the manager's son.He thanked me very much and gave me the money after we had a dinner.
求证:OE=CD.