The graph of first ionization enthalpy versus atomic number as follows:
Correct answer: B. Noble gases are at the maxima and alkali metals at the minima.
- A. Alkali metals are at the maxima and noble gases at the minima.
- B. Noble gases are at the maxima and alkali metals at the minima.
- C. Transition element are at the maxima.
- D. Minima and maxima do not show any regular behaviour.
Explanation
In a period, alkali metals have the lowest and noble gases have the maximum ionisation energy.Hence, (b) is correct.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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