3.1 The periodic table The table below is part of the periodic table compiled

3.1 The periodic tableThe table below is part of the periodic table compiled by John Newlands in 1864. He arranged the elements in order of their relative atomic masses and found a repeating pattern. He arranged the elements into seven groups, every eighth element having similar properties.1234567HLiBeBCNOFNaMgAlSiPSClKCa(a) Suggest one reason why this part of Newlands’ table is different from the modern one. (1 mark)In 1869 Dimitri Mendeleev arranged the elements by putting them in order of their atomic weights. When he put them into a table he ensured that elements with similar properties were in columns.(b) What two things did Mendeleev do to ensure that elements in the same column had similar properties? (2 marks)(c) Explain how the periodic table is now based on atomic structure. (3 marks)(d) Why it is not possible to find a new element that would fit between carbon and nitrogen? (1 mark)(e) Explain, in terms of electrons, why rubidium is more reactive than sodium. (4 marks)The table shows how group 7 elements react with iron in the form of iron wool.ElementReaction with iron woolDescriptionProductFluorineIron burns without being heatedIron fluorideChlorineHeated iron glows brightlyIron chlorideBromineHeated iron glowsIron bromideIodineIron glows if heated stronglyIron iodide(f) Explain why group 7 elements react in a similar way with iron. (2 marks)(g) Explain the difference between the reactions of fluorine and iodine with iron. (2 marks)(h) Explain why group 0 elements are found as single atoms. (2 marks)