【简答题】不同元素的原子在分子内吸引电子的能力大小可用一定数值x来表示, x越大,其原子吸引电子的能力越强。 下面是某些短周期元素的x值: 元素符号 Li Be B C O F Na Al Si P S Cl x值 0.98 1.57 2.04 2.55 3.44 3.98 0.93 1.61 1.90 2.19 2.58 3.16 (1)通过分析x值变化规律,确定Mg的x值范围:_______ 1.7时,...
【简答题】Young people and older people do not always agree. They sometimes have different ideas about living, working and playing. But in one special program in New York State , s and agers live toget...
【简答题】Translation the underlined sentences: Young people and older people don't always agree. They sometimes have different ideas about life, work and play. But in one special program in New York state, adu...