A、B、C、D、E、F六种短周期元素,它们的原子序数依次增大。A原子核内无中子;A和E、D和F分别同主族,且B与D最外层

1个回答

  • (1)第二周期第Ⅰ主族

    (2)H 2(g)+1/2O 2(g)==H 2O(l) △H=-285.8KJ/mol

    (3)

    (4)①离子;②H ++HSO 3 -==H 2O+SO 2

    (5)S 2-+ H 2O 2+ 2H +== S↓ +2H 2O