EVERYDAY SCIENCE

Detailed explanation-1: -Each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name. The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. Groups are labeled at the top of each column.

Detailed explanation-2: -In the most common format of the table, the elements are arranged in order of increasing atomic numbers. The periodic table is not simply a grid of elements arranged numerically. In the periodic table, the elements are arranged in horizontal rows called periods, and into vertical columns called groups.

Detailed explanation-3: -The horizontal rows in a periodic table are known as periods. There are a total of seven horizontal rows (periods) present in the modern periodic table. The vertical columns of elements having similar properties are known as groups.

Detailed explanation-4: -The horizontal rows in the modern periodic table are called periods. The modern periodic table contains 7 periods.