Question

Look at the following elements and tell what information you can deduce from the given data.

1. Calcium 20 = Group 2 & Period 4
2. Oxygen = Group 6A & Period 2

Answer 1

The halogen elements are the six elements in Group 17 of the periodic table. Group 17 occupies the second column from the right in the periodic table and contains fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts).