Classification of Elements and Periodicity in Properties questions
826 published questions with worked solutions.
- The species Ar, K^+ and Ca^ 2+ contain the same number of electrons. In which order do their radii increase?
- Which of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C,...
- What is the value of electron gain enthalpy of Na^+ if IE_1 of Na = 5.1 eV?
- The correct order of the decreasing ionic radii among the following isoelectronic species is:
- Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O,...
- Which one of the following ions is the largest in size?
- The electronic configuration of an element is 1s^22s^22p^63s^23p^3. What is the atomic number of the element which is placed just...
- In the periodic table, from left to right in a period, the atomic volume:
- Which electronic configuration of an element has an abnormally high difference between its second and third ionization energies?
- One of the characteristic properties of non-metals is that they:
- In the periodic table, with increase in atomic number, the metallic character of an element:
- In the IUPAC nomenclature of elements, what is the atomic number for the element 'Unh'?
- The ionic radii for ions Li^+, Be^ 2+ , Na^+ and Mg^ 2+ are 0.31 Å, 0.72 Å, 0.76 Å, and 1.02 Å (not in the same order). What is...
- How many of the following first ionization energy orders is/are correct? (i) C<O<N<F (ii) Ne>Cl>P>S (iii) Na<Mg<Al
- The first ionization potentials of Cu, Ag and Au are 731, 745 and 890 kJ/mol (not in the same order). What is the numerical value...
- For an element, the successive ionization enthalpies are given below (in kJ/mol): | I.E.1 | I.E.2 | I.E.3 | I.E.4 |...
- In how many of the following processes is there a release of energy? (i) O_ (g) + e^- O^-_ (g) (ii) O^-_ (g) + e^- O^ 2- _ (g)...
- The electron gain enthalpies of F, Cl, O and S are -142, -200, -333 and -349 kJ/mol (not in the same order). What is the...
- Consider the elements up to atomic number 10. How many of them have positive electron gain enthalpy?
- On the Pauling scale, how many of the following have electronegativity >3? C, N, O, F, S, Cl, Br
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