Question

distinguished between groups and periods​

Answer 1

Answer:

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

Explanation:

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Answer 2

Answer:

if it is related to the chapter of periodic table then groups are the the horizontal and as well as periods are the vertical section in the periodic table for more information visit to the periodic table you will got some table under a line up to 12 18.