How many groups are there in the modern periodic table?
18, 8
8, 18
18, 7
7, 18
In the modern periodic table, there are 18 columns called groups.
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
(a) group 8 (b) group 2 (c) group 18 (d) group 10
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods. (b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups. (d) It has 7 horizontal rows known as groups.
There are 7 columns and 18 rows in the periodic table.