In the periodic table, the vertical columns are called ______ (periods/groups)

In the periodic table, lead belongs to which group

In the periodic table, thallium belongs to which group

In the periodic table, bismuth belongs to which group

In the periodic table, nitrogen belongs to which group

In the periodic table, arsenic belongs to which group

In the periodic table alkali metals are placed in the group:

In the periodic table, going down in fluorine group

Atomic size decreases in a ___________of the periodic table as the atomic number increases from left to right. (group/period)

Name or state the following with reference to the element of the first three periods of the periodic table. Non-metallic element present in Period 3 of Groups 15 and 16.

The vertical columns in Mendeleev's table were called :