Question

define horizontal and periods in chemistary.**

Answer 1

hey mate!!

here is u r answer!!

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horizontal line is called period.

vertical line is called group.

ok help u

Answer 2

Heya!!!!!!!!
Here is ur answer!!!!!!!



The periodic table is devided in rows and columns.


Horizontal arrangements is called periods
There are 7 periods.



Vertical arrangements is called groups
There are 18 groups.

Hope it helps!!!!!!!!



Have a good day !!!!!!!!!!!