8.1. Arrangement of elements
A subsection of Chemistry, 5070, through 8. The Periodic Table
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This question is about elements in Group V of the Periodic Table. The table shows some properties of the Group V elements. element density at room temperature in g / cm3 melting point in °C nitrogen 1.17 × 10–3 –210 phosphorus 2.34 arsenic 5.73 antimony bismuth 9.80 Use the information in the table to: predict the density of antimony suggest why it is difficult to predict the melting point of arsenic. The structure of two compounds of phosphorus, R and S, are shown. H H H P S R Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ Na+ P3– P3– P3– P3– P3– P3– P3– P3– P3– Explain in terms of structure and bonding why compound R has a high melting point and compound S has a low melting point. compound R compound S Explain why compound R conducts electricity when molten. Draw a dot-and-cross diagram for a molecule of compound S. Show only the outer shell electrons. An oxide of phosphorus has the formula P4O10. Calculate the percentage by mass of phosphorus in this compound.
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THEORY
2021
Paper 2, Variant 2
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