His order is that all of us ____(get) there before 5 o'clock.
在横线上填上适当的词
不朽的____ 奇异的____ 连绵起伏的____ 银光闪闪的____
①微粒半径:S2﹣>Cl>S>F
②氢化物稳定性:HF>HCl>H2S
③离子还原性:S2﹣>Cl﹣>Br﹣>I﹣
④氧化性:Cl2>S>Se>Te
⑤酸性:H2SO4>HClO4
⑥非金属性:F>Cl>S.