How is oxygen different from other elements of the same group ? What are the reasons ?

Be(IIA) shows different behaviour as compared to other elements of the same group the reason is

Why does the first element of a group differ from the other elements of the same group ?

The elements of same group of the periodic table have

The elements of same group of the periodic table have

Why does boron differ from other elements of its own group in several properties?

Why beryllium is different from other members of its group in some properties?

How does reptilia differ from other vertebrates ?

Explain why the elements of the same group exhibit the same chemical behaviour.

The first element of the group 1 and 2 are different from other members of the respective group.Their behaviour is more similar to the second element of the following groups,What is this relationship known as ?

identify the group 2 element 'X' in each of the following (i) The chemistry of X is quite different from that of other element in the group. (ii) 'X' forms organometallic compound RXBr. Which is very widely used?