関連ワード:
elements in group 2a are called elements in group 2 are called elements in group 2 are called alkaline earth metals elements in group 2a are known as the elements in group 2 are all called alkaline earth metals elements in group iia 2 are called the elements in group 2 are called the ___ metals elements found in group 2 are called the elements in group 2 are called the blank elements in group 2 are all called
