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A non-metal element which lies in the third row of the Periodic Table forms a gaseous compound H2Y with hydrogen and the compound
Li2Y with lithium, which has a solid crystalline structure and a high melting point (greater than 900 °C).
A non-metal element which lies in the fourth row of the Periodic Table forms a gaseous compound HZ with hydrogen and the compound KZ with potassium, which has a solid crystalline structure and a high melting point (greater than 700 °C).
Identify to which Group of the Periodic Table the elements Y and Z belong and hence write down the name and chemical symbol of Y and
Z. Give brief reasoning on how you arrived at your answers, including the likely valency of Y and Z in the compounds given.
What type of bonding is involved in compounds Li2Y and KZ? Give your reasoning.
(iii) State two different conditions under which you would expect
compounds Li2Y and KZ to conduct electricity. Explain your answer in terms of the type of bonding found in the compounds