Question

Periodic table with all it properties and exceptions

Answer 1

1) The position of Hydrogen in the periodic table

2) The position of Helium in the periodic table. It is placed along with noble gases despite the fact that it has only 2 electrons in its valence shell, while other noble gases have 8 electrons in their valence shell.

3)The properties of the first member of each group are slightly different from the rest of the members.

4)The first member of all the groups are less metallic in nature.

5) Diagonal relationship between first member of a group and the second member of the next group.

6)The atomic size increases down the group but this trend is not successful in transition elements .