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Study the table below and answer the questions that follow:
(a) Complete the table by filling in the missing atomic numbers and atomic mass.
(b) Write the electron arrangement for the following ions: (i) #Ca^+# (ii) #P^(3-)#
(c) What is the melting point of hydrogen in Kelvin?
(d) Which of the allotropes of phosphorus has a higher density? Explain. Answer