①粒子半径:S2﹣>Cl>S ②氢化物稳定性:HF>HCl>PH3;
③离子还原性:S2﹣>Cl﹣>Br﹣>I﹣ ④单质氧化性:Cl2>S;
⑤酸性:H2SO4>HClO4 ⑥碱性强弱:KOH>NaOH>Mg(OH)2 .