Question

structure of modern periodic table ​

Answer 1

Explanation:

In the modern periodic table, the elements are arranged in the order of their inreasing atomic number. In the modern periodic table there are seven horizontal rows called periods and eighteen vertical columns (1 to 18) called groups. The arrangement of the periods and groups results into formation of boxes.

Answer 2

Explanation:

Elements are arranged from left to right and top to bottom in order of increasing atomic number.The rows are called periods.The number of electrons in a period increases as one moves down tge periodic number.The column are called group.