Answer:
elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups.
The chemical elements see arranged in order of increasing atomic number. The horizontal rows are called periods and vertical columns are called groups
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Answer:
elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups.
Answer:
The chemical elements see arranged in order of increasing atomic number. The horizontal rows are called periods and vertical columns are called groups