Question

write the number of vertical columns and horizontal rows in the modern periodic table what are the columns and rows are called

Answer 1

hlo mate here is ur answer .


there are 18 vertical coulmns and 7 horizontal rows in the modern periodic table .vertical coloumns are called groups and horizontal rows are called periods.

Answer 2

HLO MATE HERE U GO

⭐. Vertical columns ( groups ) are 18 .

⭐. Horizontal rows ( periods ) are 7 .