Dalton classified the elements into eighteen groups.

Name two elements of each group.

Chalcogens are elements of the group

The element belonging to group 17 is

Who classified the elements on the basis of fundamental properties of elements like atomic mass?

The property used by Mendeleev to classify the elements in his periodic table is "________" .

Name all the elements of group 17.

The element belonging to Group 17 is

What are functional groups ? How are the organic compounds classified on the basis of functional groups ? Mention the functional group of each class and give at least one example.

Name the first element of group 13.

Discuss and compare the trend in ionisation enthalpy of the elements of group 1 with those of group 17 elements.