A、B、C、D、E、F、G、H 是八种短周期主族元素。根据下表完成后面填空：(所有空都用元素符号或化学式填写)                                                                                                                                                                                                                                                                                       

族 周期	ⅠA	ⅡA	ⅢA	ⅣA	ⅤA	ⅥA	ⅦA	0
1	A
2				B	C	D
3	E		F			G	H