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question_answer1) Why is atomic number a better basis for classification of the elements than atomic mass?
question_answer2) Why do elements in a group show similar chemical properties?
question_answer3) Third period has eight and not eighteen elements. Explain.
question_answer4) Hydrogen is regarded as a rogue element in the periodic table. Discuss.
question_answer5) Why are there fourteen elements in the lanthanoid series?
question_answer6) Why is \[{{\Delta }_{i}}{{H}_{1}}\] of Mg more than that of Al?
question_answer7) Ne and \[N{{a}^{+}}\] ions are isoelectronic species. Do they have same ionization enthalpies also?
question_answer8) The valence of representative elements is either equal to the number of valence electrons or eight minus this number. Explain.
question_answer9) Why is\[{{\Delta }_{i}}{{H}_{2}}\]value of an element more than its \[{{\Delta }_{i}}{{H}_{1}}\] value?
question_answer10) Chlorine can be converted into chloride ion more easily as compared to fluoride ion from fluorine. Explain.
question_answer11) Alkali metals do not form dipositive ions. Why?
question_answer12) Among the elements K, Mg, C and N which would show the maximum difference in the first and second ionization enthalpies.
question_answer13) What would be IUPAC names and symbols for elements with atomic numbers 122, 127, 135, 149 and 150?
question_answer14) The element 119 has not been discovered. What could be the IUPAC name and symbol for this element? On the basis of the periodic table, predict the electronic configuration of this element and also the formula of its most stable chloride and oxide.
question_answer15) Why has the zero group been placed at the extreme right of the periodic table?
question_answer16) The first ionization enthalpy of carbon atom is greater than that of boron whereas the reverse is true for the second ionization enthalpy. Explain.
question_answer17) Which of the elements Na, Mg, Si and P would have the greatest difference between the first and the second ionization enthalpies. Briefly explain your answer.
question_answer18) Arrange the following elements in the increasing order of non-metallic character : B, C, Si, N, F.
question_answer19) Arrange the following ions in order of decreasing ionic radii: \[L{{i}^{2+}},\,H{{e}^{+}},\,B{{e}^{3+}}\].
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