![]() Which of the following processes involves absorption of energy? Li (g) + Cl (g) → Li + (g) + Cl – (g) if the resultant ions do not combine with each other is The first ionisation energy for Li is 5.4 eV and electron affinity of Cl is 3.61 eV. Which of the following is the smallest cation? Pick out the isoelectronic structures from the followingĮka-alurninium and Eka-silicon are known asĮlement with atomic number 56 belongs to which block? The group of elements in which the differentiating electron enters the antepenultimate shell of the atoms are called Identify the least stable ion amongst the following. Which of the following groupings represents a collection of isoelectronic species? ![]() The ionic radii of isoelectronic species N 3-, O 2- and F – in Å are in the order. AnswerĪnswer: (c) a significant decrease from O 2- to Al 3+ (d) a decrease from O 2- to F – and then increase from Na + to Al 3+. (c) a significant decrease from O 2- to Al 3+ (b) an increase from O 2- to F – and then decrease from Na + to Al 3+ (a) a significant increase from O 2- to Al 3+ The ions O 2+, F –, Na +, Mg 2+ and Al 3+ are isoelectronic, their ionic radii show. (a) NO +, C\(_\)Īccording to the periodic law of elements the variation in properties of elements is related to their The radii of F, F –, O, D 2- are the order ofĪmong the following groupings which represents the collection of isoelectronic species. ![]() The increasing order of the a tomifc radius for the elements Na, Rb, K and Mg isĬonsider the isoelectronic series : K +, S 2-, Cl 1- and Ca 2+, the radii of the ions decrease as
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