The number of elements in the 5th period is

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Solution

The correct option is C
18

The number of elements in the 5th period of the periodic table is 18. The first element in the 5th period has atomic number 37 which is Rubidium. The list of elements that are in the 5th period in the proper order of increasing atomic number is Rubidium, Strontium, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Ruthenium, Rhodium, Palladium, Silver, Cadmium, Indium, Tin, Antimony, Tellurium, Iodine and Xenon.

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