A group of the element is the Periodic table are given below. (Boron is the first member of the group and Thallium is the last.)

Boron

Aluminium

Gallium

Indium

Thallium

Answer the following question in relation to the above of element;

i)   Which element has the most metallic character?

ii)  Which element would be expected to have the highest electronegativity? : 

iii) If the electronic configuration of Aluminium is 2,8,3 how many electrons are there in the outer shell of Thallium? 

iv) The atomic number of Boron is 5. Write the chemical formula of the compound formed when Boron react with chlorine. 

v)  Will the elements in the group to the right to this Boron group be more metallic or less metallic in character? Justify your answer

Name the charged particles which attract one another to form electrovalent compounds.

In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?

The electronic configuration of nitrogen is 2,5 how many electrons in the outer shell of a nitrogen atom are not involved in the formation of nitrogen molecules?

In the formation of magnesium chloride (by the direct combination of magnesium and chlorine), name the substance that is oxidised and the substance that is reduced