5. the periodic table is organized into
umns called
a. groups c. periods
b. categories d. rows

The Answer is A

Explanation: The most noticeable feature of the periodic table is that it is arranged as a chart with seven rows and eight columns, although the number of columns increases toward the bottom of the chart. Chemists refer to each row as a period and each column as a group. Each element in a period has the same ground state, and the elements become less metallic as you move from left to right. Elements in the same group have different ground states, but they have the same number of electrons in their outer shells, which gives them similar chemical properties.

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i don't understand. explain it clearly