7th period of the periodic table contains normal elements:
Correct answer: A. 2
- A. 2
- B. 3
- C. 4
- D. 8
Explanation
The period 7 is incomplete so far. It contains only two normal elements Fr87 and Ra88 , ten transition elements and fourteen inner transition elements. The inner transition elements of this period are called Actinides, as they follow 89Ac.The actinides are also shown at the bottom of the periodic table under the Lanthanides. Due to their scarcity, the inner transition elements are also called rare earth 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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