1.1. The Periodic Table consists of elements arranged in a particular order. 

What is the Periodic Table arranged in order of?

1.2. Element Y is located in Group VII of the Periodic Table. 

Write the formula of the ion formed by element Y. 

1.3. Give two physical properties of element Y. 

1.4. Going down Group VII reactivity decreases. 

Explain why reactivity decreases going down Group VII using words from the list. 

Going down the group, the number of electron shells .................. so the outer electron is .........................  the nucleus.

There are ............................ elecrostatic forces of attraction between the outer electron and nucleus making it harder for the element to ............... an electron.