Question

define two features of group and period modern periodic law ​

Answer 1

Answer:

Elements are arranged in the increasing order of atomic numbers. Elements in the modern periodic table are arranged in 7 periods and 18 groups. Horizontal rows are called periods and vertical columns are called groups. Elements are placed in periods based on the number of shells in their atoms.

Answer 2

$\underline{\underline{\red{\textsf{Features of group and period modern periodic law :-}}}}$

‎ ‎ ‎ ‎ ‎ ‎$\star$Elements are arranged in the increasing order of atomic numbers.

‎ ‎ ‎ ‎ ‎ ‎$\star$Elements in the modern periodic table are arranged in 7 periods and 18 groups.

‎ ‎ ‎ ‎ ‎ ‎$\star$Horizontal rows are called periods and vertical columns are called groups.

‎ ‎ ‎ ‎ ‎ ‎$\star$Elements are placed in periods based on the number of shells in their atoms.