1
The name of the group number 2 of the Periodic Table
2
The table in which all chemical elements are arranged and kept
3
Selenium is a........
4
The first halogen
5
It has valence 1 but it's nor an alkali metal, neither a nonmetal
6
The elements of the left side of the table
7
This transition metal only has valence number 1 and it is used in jewellery
8
The columns of the periodic table are called.....
9
The smallest particle that constitutes a chemical element
