Question

DESCRIBE STRUCTURE OF MODERN PERIODIC TABLE

Answer 1

Answer:

which class is this and what chapter?

Answer 2

Answer:

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.