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The element radium belongs to

Correct answer: C. Alkaline-earth metals

  • A. Actinide series
  • B. Lanthanide series
  • C. Alkaline-earth metals
  • D. Chalcogens.

Explanation

Radium is classified as an alkaline-earth metal, which is a group of elements in Group 2 of the periodic table characterized by their shiny luster and good conductivity. These elements typically form +2 oxidation state ions. Radium shares these properties and is situated below barium in the same group. The other options are incorrect because:Actinide series: This consists of elements from actinium to lawrencium, primarily located in the f-block of the periodic table, which radium is not part of.Lanthanide series: These elements range from lanthanum to lutetium and are also part of the f-block, distinct from the s-block alkaline-earth metals where radium resides.Chalcogens: These are found in Group 16 of the periodic table and have different chemical properties compared to the alkaline-earth metals.

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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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