The number of elements in each of the long periods of periodic table is
Correct answer: B. 18
- A. 32
- B. 18
- C. 8
- D. 36
Explanation
The periodic table is structured into periods and groups. Long periods refer to periods 4 and 5, each of which consists of 18 elements. This is due to the filling of the d subshells in addition to the s and p subshells, which are characteristic of these periods. Option B is correct because it accurately reflects the number of elements in these long periods. Option A is incorrect as 32 elements are found in the 6th and 7th periods when considering the f-block elements. Option C is incorrect as it pertains to the shorter second and third periods. Option D is incorrect as no standard period contains 36 elements.
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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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