Look at the ionic compounds on the right. The relative size and charge of each ion is shown. From what you know of the properties of ionic compounds answer the following questions.

1)Place the compounds in order of increasing melting point.

2)Which compound conducts electricity in the solid and molten states?

3) Which coloured ion (green or orange ) is the metal ion?

Above is the electronic configuration of some elements. Answer the following questions.

1) Which one of the following compounds will have the highest melting temperature? Explain.

The compound formed from element X and element O
or the compound formed from element Y and element R .

2) Answer True of False to the following comments.

a) The ion formed by element "X is bigger than the ion formed by element "Y".
b) The ion formed by element "Z" will have a charge of 2+
c) An ionic compound can form between the elements "Z" and "O"
d) When element "Z" and element "X" react the compound formed will be brittle and conduct electricity in the solid state as well as the molten state.
e) When elements "D" and "R" react "D" will form the positive ion while "R" forms the negative ion.
3) Jonathon was having problems conducting an electric current through a sample of water. Stephen suggested dissolving a powder containing a pure compound made form element "R" and "O". Irene disagreed and suggested dissolving the soluble compound YR. Who is right? Explain.