Question : Which of the following are members of 15 naturally occurring metallic chemical elements whose atomic numbers are between 57 and 71?
Option 1: Alkali metals
Option 2: Lanthanides
Option 3: Halogens
Option 4: Actinides
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Correct Answer: Lanthanides
Solution : The correct answer is Lanthanides.
Lanthanides are a series of 15 metallic elements from lanthanum to lutetium in the periodic table, and their atomic number ranges from 57 to 71. The modern periodic table consists of 118 elements arranged in 18 groups and seven periods. Lanthanides and Actinides are the two series of 'F Block' elements and these are placed in Group 3 and occupy Periods 6 and 7 of the periodic table, respectively.
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