Question

关于元素周期表的几个英语问题!懂英语和化学的进~

Answer 1

(iv)1.Alkali metals

2.increases

3.halogens

4.decreases

(V) Noble gases

(VI) F

(VII) NaF

补充的：you'll see red-brown liquid (Br2) appearing in the solution.

因为Cl2把Br2给置换出来了