Question

The preriodic table is arranged in columns and rows. What are the columns and the rows of the periodic table called?

A) periods and energy levels
B) atomic numbers and periods
C) grours and periods
D) grouns and atomic number

Answer 1

The periodic table is arranged in horizontal rows called periods and vertical columns called groups. A period is a row of elements on the periodic table, and there are seven periods in total. Each period begins when a new principal energy level begins filling with electrons. A group, on the other hand, is a column of elements that share similar chemical properties. The periodic table has 18 groups, which are numbered from 1 to 18, starting from the leftmost column.

Step-by-step explanation:

The periodic table is arranged in horizontal rows called periods and vertical columns called groups. A period is a row of elements on the periodic table, and there are seven periods in total. Each period begins when a new principal energy level begins filling with electrons. A group, on the other hand, is a column of elements that share similar chemical properties. The periodic table has 18 groups, which are numbered from 1 to 18, starting from the leftmost column.