In the United States,the letter A identifies the main group elements and the letter B indicates the transition metal elements of the periodic table.

Name: In the United States,the letter A identifies the main group elements and the letter B indicates the transition metal elements of the periodic table.
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The traditional labeling system in the United States used letters A and B to distinguish between main group elements (A) and transition metals (B) in the periodic table.

In the United States,the Letter a Identifies the Main Group