Base your answers to questions 51 through 54 on
the information below and on your knowledge of chemistry.
The diagram below represents three elements in Group 13 and three
Period 3 and their relative positions on the Periodic Table.
Some elements in the solid phase exist in
different forms that vary in their physical
properties. For example, at room temperature, red phosphorus has a
density of 2.16 g/cm3 and white phosphorus has a density
of 1.823 g/cm3.
51 Identify the element from the diagram that will react with
chlorine to form a compound with the general formula XCl4.
52 Consider the Period 3 elements in the diagram in order of increasing
atomic number. State the trend in electronegativity for these elements.
|Answer--> As atomic
number increases, the electronegativity increases.
53 Compare the number of atoms per cubic centimeter in red phosphorus
with the number of atoms per cubic centimeter in white phosphorus. 
|Answer--> Red has more, or white has
54 Identify one element from the diagram that will combine with
phosphorus in the same ratio of atoms as the ratio in aluminum phosphide.
|Answer--> ReGallium or Indium