Question

long form or extended form of the periodic table​

Answer 1

Answer:

The vertical columns are called groups and the horizontal rows are called periods. There are altogether 18 groups and 7 periods in the long form (or) extended form of periodic table. Elements are arranged in the increasing order of their atomic numbers. From left to right the atomic number increases by one unit.

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Answer 2

Explanation:

long form of periodic table!!

➡ periodic table consists of 18 groups(columns) and 7 periods(rows)